David Krayesky

Slippery Rock University | SRU · Department of Biology

Arundinaria gigantea was previously unreported from Pennsylvania. We report the occurrence of this species from New Wilmington Township, Mercer County in western Pennsylvania.

Forty seven mosses and nine liverworts are reported new to Wayne County, Pennsylvania thereby increasing the number to 91 known bryophyte species from 71 genera and 45 families. Species of interest include Physcomitrium immersum, Weissia phascopsis, Pterigynandrum filiforme, and Lejeunea lamacerina subsp. geminata.

Range extensions to Butler County (Albizia julibrissin, Maclura pomifera and Magnolia kobus), Mercer County (Bellis perennis), Venango County (Lespedeza cuneata), and both Allegheny and Lawrence Counties (Arundinaria gigantea) are reported. All species are non-native to Pennsylvania, and L. cuneata and A. julibrissin are considered invasive species...

Several new Sphagnum species occurrences are reported for each of Butler, Crawford, Mercer, and Venango Counties in northwestern Pennsylvania. Five new county records are reported from Butler County: S. centrale, S. cuspidatum, S. flexuosum, S. girgensohnii, and S. subtile. Sphagnum contortum and S. palustre are new to Crawford and Mercer Counties,...

The crustose red algal genus Peyssonnelia (Peyssonneliales, Rhodophyta) in the Azores: from five to one species. Arquipelago. Life and Marine Sciences 32: 1-9. The family Peyssonneliaceae comprises a worldwide group of non-calcified to calcified, crust-forming red algae of great ecological significance. Of the genera currently recognized in the fam...

In the northwestern Gulf of Mexico, beds of rhodoliths and unconsolidated rubble at 55-70 m depth are associated with unique offshore deep bank habitats known as salt domes or diapirs. Prior to the 2010 BP Deepwater Horizon oil spill these harbored the highest known seaweed diversity in the northern Gulf of Mexico. Six post-spill cruises led offsho...

The generic concepts of the crustose family Peyssonneliaceae will be critically assessed in a revised worldwide phylogeny of the family on the basis of phylogenetic analysis of chloroplast-encoded rbcL and tufA, chloroplast 23S UPA and mitochondrial cox1 sequences derived from 336 samples worldwide representing 172 species and twelve genera. Type o...

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Range extensions to Butler County (Hibiscus moscheutos), Crawford County (Heracleum maximum and Lamium maculatum) and both Butler and Crawford Counties (Robinia hispida and Bellis perennis) are reported. All populations are well established. The importance of the range extensions for Bellis perennis rests in the fact that the species can be weedy a...

Although the systematics of Caloglossa has been intensely investigated, the species diversity of the genus is not yet fully understood. Comparative chloroplast-encoded rbcL and nuclear LSU rDNA sequence analyses, combined with morphological observations, reveal new records and two new species for the Americas. The species, previously identified as...

The red algal genus Caloglossa (Delesseriaceae, Ceramiales) in the New World is represented by Caloglossa leprieurii sensu lato. The earliest name for any species in the genus, other than the basionym Delesseria leprieurii, is Apiarium apiculum. On the basis of comparative morphological data, and rbcL and LSU rDNA sequence analyses, the C. leprieur...

Gelidium J.V. Lamouroux is an economically and ecologically important red algal genus including about 118 species worldwide. A total of 17 species are reported in Korea. We collected G. crinale, G. divaricatum, G. elegans, G. vagum, an unidentified species and studied phylogenetic relationships of the species using rbcL, psaA, and cox1 genes. Topol...

The Peyssonneliaceae Denizot comprises a worldwide group of non-calcified or calcified, crust-forming red algae found in diverse, intertidal to deep subtidal marine habitats. Eight genera have been recognized in the family, with Peyssonnelia Decaisne having the largest number of species. Both comparative morphology and rbcL and nuclear LSU rDNA seq...

Kumanoa), and the Sections Aristata, Helminthoidea and Batrachospermum of Batrachospermum. We also provide a new name, B. montagnei, for the illegitimate B. guyanense. This tax-onomic synthesis increases the level of monophyly within the Batrachospermales, but minimises taxonomic change where data are still needed.

Since the 1899 Schiffner publication describing Fossombronia japonica Schiffn., 16 taxa of Fossombronia Raddi have been reported from Eastern Asia and Oceania. Of these, seven were named as new taxa. Although several regional studies have been published, no study of the genus has ever been undertaken for the entire region. We have conducted a compr...

Phylogenetic analyses inferred from rbcL sequences indicates that specimens of Caloglossa (Harvey) G. Martens collected from Vermilion Bay, Louisiana and Galveston, Texas, reported as C. leprieurii (Montagne) G. Martens (1869) constitutes a separate taxon. Studies are presently being conducted to compare this northwestern Gulf of Mexico taxon with...

The upper Northwestern Gulf basin is characterized by a relatively shallow but well developed continental shelf with an extensive system of mid- and outer shelf hard banks formed on unique tectonically created salt diapirs of varying origin and composition. Collections made by our laboratory from ∼30 m depth by SCUBA while participating in monitori...

Data concerning the cytoskeletal components of red algae are scant. The goal of this ongoing comparative survey is to develop a more complete characterization of the red algal cytoskeleton, and subsequent elucidation of its function, using representative taxa belonging to major evolutionary lineages within the Rhodophyta. Preliminary data were obta...

Lectotypes are explicitly designated for 43 taxa in the genus Fossombronia Raddi, with neotypes designated,for F. mauritanica Trab. and F pusilla var. beta capitata Nees. One name, F. pumila Dumort, is regarded as an orthographic error not based upon a specimen and thus, cannot be (typified. The entries are listed alphabetically, each with the corr...

"Department of Plant Biology." Thesis (M.S.)--Southern Illinois University at Carbondale, 2000. Vita. Includes bibliographical references (leaves 102-109).