Roger Rosentreter's research while affiliated with Boise State University and other places
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Publications (72)
Coastal areas around the globe are threatened with sea-level rise (SLR). Many of these areas support coastal forests, and determining the threat is complicated by wind patterns and sea floor and shoreline variability, beyond simple elevational concerns. Lichens can be used as indicators of SLR at site specific locations. Developing vegetative indic...
Twenty-five North American lichens are issued in Fascicle VIII of the "Anderson and Shushan: Lichens of Western North America" series, numbers 176-200. This fascicle is comprised of material representing specimens from the Rhizoplaca melanophthalma aggregate, including the vagrant taxa R. arbuscula, R. haydenii, and R. idahoensis; two collections r...
Bulletin of the California Lichen Society 28(1): 1-7.
<http://californialichens.org/bulletin/CALS_2021_28-1.pdf>
The rare patches of alkali desert scrub habitat in southern California superficially look harsh and barren. In dry years they really seem empty, with only a few dead looking shrubs. However, when one looks closer it is clear that these h...
Based on field collections made during the summers of 1987, 1988, and 1989, we report 159 species of lichens in 69 genera for the Jarbidge Wilderness Area (JWA) and adjacent Forest Service lands, located in the northern Great Basin, USA. Specimens were collected at 25 sites, distributed across the JWA along with two additional sites north of the wi...
Our manuscript “Grazing disturbance promotes exotic annual grasses by degrading soil biocrust communities” (Root et al. 2020) demonstrated that livestock grazing can promote exotic annual grasses indirectly through the disruption of biocrusts, which are disturbance‐sensitive communities (Ponzetti & McCune 2001) that often cover the soil in arid and...
We inventoried lichens in Kenai Fjords National Park in Alaska, USA We assembled the known information on occurrence and ecology of lichens in this park by combining field, herbarium, and literature studies. Our results provide baseline data on lichen occurrence that may be used in resource condition assessments, vulnerability assessments, long-ter...
Biological soil crusts (BSCs), or biocrusts, are composed of fungi, bacteria, algae, and bryophytes (mosses, etc.) that occupy bare soil, entwining soil particles with filaments or rootlike structures and/or gluing them together with polysaccharide exudates to form a consolidated surface crust that stabilizes the soil against erosion. BSCs are comm...
In 2016, a storm blew over an old growth sand post oak tree (Quercus margarettae) at O'Leno State Park in northern Florida. This event provided access to the entire tree without climbing it. Because the tree was suspended by its branches so it was parallel with the ground, we could easily observe and collect lichens at all former canopy heights. We...
Three species of lichenized basidiomycetes in the Dictyonema clade from southeastern North America are described as new to science: Cyphellostereum georgianum , C. jamesianum and Dictyonema lawreyi , all with a crustose-filamentous growth form. Based on ITS sequences, the species form well-supported monophyletic clades in a phylogeny and are repres...
Natural history collections, including name-bearing type specimens, are an important source of genetic information. These data can be critical for appropriate taxonomic revisions in cases where the phylogenetic position of name-bearing type specimens needs to be identified, including morphologically cryptic lichen-forming fungal species. Here, we u...
Reintroducing lichens and mosses to areas slated for restoration or rehabilitation may prove integral to project success by filling the biocrust component (niche) of arid ecosystems. In doing so, it is important to select appropriate species and genetic source material. Some bryophyte and lichen species are early pioneers and are potentially well‐s...
Exotic invasive plants threaten ecosystem integrity, and their success depends on a combination of abiotic factors, disturbances, and interactions with existing communities. In dryland ecosystems, soil biocrusts (communities of lichens, bryophytes and microorganisms) can limit favorable microsites needed for invasive species establishment, but the...
Restoration targets for biological soil crusts are largely unknown. We surveyed seven, 80‐year old grazing exclosures across northern Nevada for biocrusts to quantify reference conditions at relatively undisturbed sites. Exclosures were associated with the following plant communities: Wyoming big sagebrush, black sagebrush and areas co‐dominated by...
We inventoried lichens in Lake Clark (LACL) and Katmai (KATM) National Parks and Preserves. We assembled the known information on lichens in these parks by combining field, herbarium, and literature studies. Our results provide baseline data on lichen occurrence that may be used in resource condition assessments, vulnerability assessments, long-ter...
In this chapter we examine the structure, composition, and function of soil biocrust (i.e., biological soil crust) communities dominated by lichens. Lichens are composite organisms resulting from a symbiotic relationship between a fungus and an alga or cyanobacterium. Biocrust lichens can tolerate a wide range of abiotic stresses such as desiccatio...
Lichens are known to be indicators for air quality; they also respond to climate. We developed indices for lichen response to climate and air quality in forests across the northeastern United States of America (U.S.A.), using 218–250 plot surveys with 145–161 macrolichen taxa from the Forest Inventory and Analysis (FIA) Program of the U.S. Departme...
Soil-inhabiting terricolous lichens along with other cryptogams such as mosses and cyanobacteria form a functional entity, referred to as biological soil crust (BSC). Lichen-dominated BSCs occur worldwide. The formation of BSCs and their species diversity is governed by factors such as, climate, soil-type, calcareousness, soil-texture, hydrology, a...
Three species, Biatoridium monasteriense, Catillaria picila and Hymenelia cyanocarpa are reported as new to North America, the first two occurring in Oregon and the last in British Columbia. Northward range extensions from California are reported for Aspicilia knudsenii, Lecanora mellea, and Lecidea mannii. The range of Caloplaca nivalis is extende...
Terricolous Lichens in India, Volume 1: Diversity Patterns and Distribution Ecology is the first ever publication dealing with soil lichens of India. Divided into five chapters, this volume discusses the lichenological researches in India with reference to terricolous lichens, the altitudinal distribution patterns of terricolous lichens, comparativ...
We report Coccocarpia filiformis as new to North America, based on 10 herbarium specimens (FH, MSC, and US) and one recent field collection. Coccocarpia filiformis has been collected in North America but misidentified since 1885. It is found in oak hammocks, scrub and cypress swamps from north Central Florida to the Panhandle, growing amongst liver...
Invasion by the exotic annual grass Bromus tectorum has increased the cover and connectivity of fine litter in the sagebrush steppes of western North America. This litter tends to cover biological soil crusts, which could affect their metabolism and growth. To investigate this possible phenomenon, biological soil crusts dominated by either the moss...
Aspen are thought to be declining in this region due to a combination of fire suppression, grazing and wildlife management practices, and potentially cool/wet climates of the past century which favor advancing conifer succession. Many scientists are concerned that aspen's related species may also be losing habitat, thereby threatening the long-term...
We present a lichen checklist of 141 species from the Lawrence Memorial Grassland Preserve and nearby lands in Wasco County, Oregon, based on collections made in the 1970s and 1990s. Collections include epiphytic, lignicolous, saxicolous, muscicolous, and terricolous species. One of these collections is the type specimen for a recently described sp...
La invasión de las estepas de “Sagebrush” por zacates anuales exóticos han modificado la estructura de comunidades de matorral de gran parte del oeste de Estados Unidos al incrementar las cargas de combustible, y por lo tanto la frecuencia de fuegos naturales. La revegetación activa con especies perennes que fomentan el crecimiento de costras bioló...
Old conifer forests in the Pacific Northwest have a wide range of microhabitats induced by canopy structure and substrate characteristics. We used the Wind River Canopy Crane to sample lichens and bryophytes throughout the spectrum of habitats available to epiphytes. Of the 111 species found in 72 sample units, 97 were lichens and 14 were bryophyte...
We sampled epiphytic and ground macrolichens in three subtropical forest types in north-central Florida (sand pine scrub, longleaf pine and hardwood bottoms). We detected 101 macrolichen taxa during community surveys in the three subtropical forest types. We used nonmeteric multidimensional scaling to determine factors associated with gradients in...
We sampled macrolichens in Noatak National Preserve to help address the need to document lichen biodiversity in Arctic ecosystems and to initiate regional-scale monitoring in the face of climate change and air pollution. We used a stratified random sample to allow unbiased park-wide diversity estimates, along with an intensive sample in a limited a...
Biological soil crusts can affect seed germination and seedling establishment. We have investigated the effect of biological
soil crusts on seed water status as a potential mechanism affecting seed germination. The seed water potential of two annual
grasses, one exotic Bromus tectorum L. and another native Vulpia microstachys Nutt., were analyzed a...
Biological soil crusts dominated by lichens are common components of shrub-steppe ecosystems in northwestern US. We conducted
growth chamber experiments to investigate the effects of these crusts on seed germination and initial seedling establishment
of two annual grasses; the highly invasive exotic Bromus tectorum L. and the native Vulpia microsta...
Biological soil crusts dominated by drought-tolerant mosses are commonly found through arid and semiarid steppe communities of the northern Great Basin of North America. We conducted growth chamber experiments to investigate the effects of these crusts on the germination of four grasses: Festuca idahoensis, Festuca ovina, Elymus wawawaiensis and Br...
Reestablishing big sagebrush on rangelands now domi-nated by native perennial grasses, introduced perennial grasses, or exotic annual grasses, particularly cheatgrass (Bromus tectorum), serves to stabilize soil, improve moisture availability and nutrient recyling, increase biological diversity, and foster community stability and resiliency. A first...
Frequent low-intensity fires are a natural component of the ecology of the Palouse prairies of northwestern North America. To study the effects of fire upon biological soil crusts (BSCs) occurring in these grasslands, we sampled three burned (in 2000) sites and three unburned sites in the Hell’s Canyon area (OR, USA) ∼1 year post-fire. We measured...
In the Western United States, substantial areas of shrub-steppe have been replaced by annual exotic grasses during the past century. These structural changes have been accompanied by functional changes in the landscape in relation to the ability of the landscape to capture essential resources such as water and sediments. Surface waterflow was measu...
Basic identification keys and comparison tables for 23 low and big sagebrush (Artemisia) taxa are presented. Differences in sagebrush ecology, soil temperature regimes, geographic range, palatability, mineralogy, and chemistry are discussed. Coumarin, a chemical produced in the glands of some Artemisia species, causes UV-light fluorescence of the l...
Epiphytic lichen communities are included in the national Forest Health Monitoring (FHM) program because they help us assess resource contamination, biodiversity, and sustainability in the context of forest health. In 1996, field crews collected lichen samples on 141 field plots systematically located across all forest ownership groups in Idaho. Re...
We compared the morphology of soil surfaces dominated by Wyoming big sagebrush at burned-seeded, burned-unseeded, and unburned sites in southern Idaho. Both burning and seeding resulted in significant changes in soil surface morphology. Unburned sites were dominated by Type I (shrub- and grass tussock-dominant coppice) and Type II (lichen- and moss...
Monitoring of rangeland health has recently transitioned from the taking of simple grass biomass measurements to a more integrated plant biodiversity and soil surface condition evaluation. One component being measured is the composition and cover of biological soil crusts (bsc). The bsc cover has been shown to correlate with soil stability. The bsc...
During the past century, land managers have grappled with methods to assess both the condition (health) and degree of change (trend) of arid landscapes [77]. Traditional approaches have focused on the documentation of various attributes of vascular plant communities [34]. More recently however, Australian and American researchers have incorporated...
Biological soil crusts in North America are diverse and found in many different habitats. On a broad scale, there are several
different vegetation zones or ecoregions in western North America that contain biological soil crusts as major components
(Fig. 2.1, Table 2.1). These include hot deserts (Mojave, Chihuahuan, Sonoran; see Chap. 1, Photos 34,...
Monitoring is the collection and analysis of repeated observations so that changes over time can be assessed. Typically, monitoring
is used to evaluate changes in landscape condition in relation to defined management goals. The objectives of a monitoring
program will determine the position in the landscape in which measurements will be made and the...
Sulcaria badia, a rare lichen endemic to western North America, had not been collected since 1971 despite more than two decades of active field work in the area of the type location. A search was undertaken to determine the current range of the species. Sulcaria badia was found on hardwood trees, mainly Quercus garryana, up to 60 km inland, and in...
Sulcaria badia, a rare lichen endemic to western North America, had not been collected since 1971 despite more than two decades of active field work in the area of the type location. A search was undertaken to determine the current range of the species. Sulcaria badia was found on hardwood trees, mainly Quercus garryana, up to 60 km inland, and in...
Microhistological analysis of 200 scats collected from two artificial nest boxes used by northern flying squirrels (Glaucomys sabrinus) in central Idaho show distinct seasonal variation. The flying squirrels consumed hypogeous, mycorrhizal fungi in the summer and arboreal lichens and hypogeous, mycorrhizal fungi in the winter. Dominant summer foods...
We examined the composition of nest material used by northern flying squirrels (Glaucomys sabrinus) occupying artificial nest boxes in central Idaho and western Montana. Nests were constructed almost entirely of arboreal lichens (96% lichen by volume). In both regions, three species of Bryoria dominated nesting material although a total of 15 speci...
The lichen Texosporium sancti-jacobi (Ascomycetes: Caliciales) is known from only four general locations worldwide, all in western U.S.A. Typical habitat of Texosporium has the following characteristics. arid or semiarid climate,- nearly flat ground; noncalcareous, nonsaline, fine- or coarse-textured soils developed on noncalcareous parent material...
Dermatocarpon miniatum (L.) Mann and D. reticulatum Magn. have vagrant forms with the gross morphology of D. vagans Imsh. Dermatocarpon vagans is not a distinct species. Rather, it is an environmental modification of D. reticulatum. Optimum habitat for vagrant Dermatocarpon in the western United States has the following characteristics: mostly flat...
Along the Oregon coast there are pockets of exceptionally high diversity of rare lichen species. These include a number of extreme disjunct populations, with affinities to the flora of the southern hemi sphere, tropical and subtropical areas, California, northeast Asia, maritime Arctic, eastern North America, and Europe. Only two of these rare spe...
Citations
... Mean annual low and high temperatures are -2.6 and 12.3 8C, respectively (Western Regional Climate Center 2007). We identified samples to species based on external characteristics using McCune and Rosentreter (1993) and McCune and Geiser (1997). After removing Bryoria spp. ...
... Rosentreter (1990) correlated increasing lichen cover on desert shrubs with increased dust and excess nitrogen in the air. In Northern Idaho, McCune and Rosentreter (1998) examined lichen species richness by forest cover types over an elevational gradient. They found greater species richness in the moist low elevation forest cover types than in the subalpine forest cover. ...
... Keys for many species have recently become available for British Columbia (Goward 1999). Otherwise the only published scientific works are descriptions of a few new species (Tibell 1991, Peterson andRikkinen 1998) and range extensions for several species (Otto 1970;Otto 1972;Pike 1972;Otto 1983;McCune and Rosentreter 1992;McCune and Rosentreter 1995;Peterson and Rikkinen 1999). ...
... Collection of terricolous lichens requires special attention right from the field. Owing to the fragility and crumbling nature of soil substratum of terricolous lichens, moistening of lichens with a fine sprayer (mister) ensures easy removal of lichens with 1–5 cm of crust (Rosentreter 1988; Awasthi 2000). As the dominant microhabitat of soil lichens in India is soil over rocks or rock crevices, pointing trowel (mason's trowel) is very useful in removing terricolous lichens from the rocky relevés (Fig. 1.3a, b). ...
... Various studies have reported and suggested using drought-tolerant native plants for low-water landscapes (McKinney, 2002;Yilmaza and Yilmazb, 2009;Sun et al., 2019). The Intermountain West region (IW) of the US is rich in drought-tolerant native plants, both woody and herbaceous, and few of them have been recommended to be used in water-efficient landscaping (Kratsch, 2011;Rosentreter et al., 2017). The microbiome of these plants has not been explored yet. ...
... Unfortunately, classifying sagebrush taxa based on morphology alone is challenging (Rosentreter et al. 2021) and misclassification may lead to errors in land cover maps (Fremgen-Tarantino et al. 2021). Although genetic tools for classification of sagebrush are emerging (Richardson et al. 2012), there is a need for inexpensive and rapid approaches to identify and monitor specific sagebrush taxa in the field. ...
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... ASAP, DNA barcoding, La Sal Mountains, Rocky Mountains, vouchered collections ecosystems (McCune et al., 2020;Nimis et al., 2018;Spribille et al., 2010Spribille et al., , 2020. These studies also reveal that a significant proportion of this diversity has not yet received formal taxonomic recognition. ...
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... If indeed this population inhabits the American Southwest, several questions about adaptations of VGVI to warm, arid environments are raised, including whether VGVI has departed from traditional niches for C. gattii, which is usually found in moist and nutrient-rich microenvironments. Dry soils in temperature-extreme environments are generally unexpected places to find fungi [20]; however, microenvironments such as the extensive cryptobiotic grounds in the southwestern United States [21,22] and organism adaptations such as those of Coccidioides spp.-both at the cellular [23,24] and life cycle levels (e.g., the soil sterilization hypothesis [25,26] and the small-mammal reservoir hypothesis [27,28])-illustrate the clear possibility of the presence of other cryptic environmental fungi in these ecosystems. Additionally, other desert-adapted yeasts exemplify survival strategies that may be suited to C. gattii. ...
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... Understanding the abundance and productivity of sagebrush is important for assessing the overall rangeland health and ecological potential (recovery after disturbance), as previous research has established soil-climate as an important driver [131,150,152]. The distribution and abundance of unvegetated ground are inversely related to the total vegetation cover, providing a robust measure of habitat structure; however, causes of patterns and trends in unvegetated soil may be diverse (e.g., due to natural and anthropogenic causes) [153], so careful interpretation is warranted. Because of the considerable management concerns [154] and modeling challenges of annual herbaceous plants within our study area (for example, Bradley et al. [155] reported variance ranging from 34% for continuous cover to 77% for a classification), we assessed the explanatory power of soil-climate for these species [156]. ...
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... Perhaps a more appropriate comparison for our findings is a recent study by Rosentreter et al. (2020) that documented the lichen diversity on a fallen, old-growth sand post oak tree, Quercus margarettae (Ashe) Small, located in northern peninsular Florida, c. 515 km NNW from our oak. A total of 32 species were recorded in their study, including two species new to Florida: Dictyonema sp. ...
