Jacques van Rooy

Jacques van Rooy
South African National Biodiversity Institute · National Herbarium

Ph.D. (Botany)
Taxonomy, phytogeography and conservation of southern African bryophytes

About

105
Publications
23,819
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Citations
Introduction
Mainly interested in the taxonomy, nomenclature, phytogeography and conservation of African bryophytes, southern African mosses in particular. Specialises in Bryaceae, Archidiaceae, Orthotrichaceae, Polytrichaceae and Sematophyllaceae.
Additional affiliations
August 2016 - April 2022
University of the Witwatersrand
Position
  • Researcher
Description
  • Postgraduate supervision
April 2010 - December 2013
University of Pretoria
Position
  • Academic Supervisor
Description
  • Postgraduate supervision
January 1979 - October 2018
South African National Biodiversity Institute
Position
  • Senior Researcher
Description
  • More than 40 years experience in herbarium curation, taxonomy, nomenclature, phytogeography and conservation of African bryophytes, southern African mosses in particular.
Education
March 1994 - December 1999
University of Pretoria
Field of study
  • PhD, Botany
March 1990 - December 1990
University of Pretoria
Field of study
  • MS, Plant taxonomy
January 1967 - December 1971
Die Hoërskool Menlopark
Field of study

Publications

Publications (105)
Article
Full-text available
Background: A Red List of threatened bryophytes is lacking for Africa. The International Union for Conservation of Nature (IUCN) Species Survival Commission (SSC) Bryophyte Specialist Group has recently launched the ‘Top 10 Initiative’ to identify the 10 species on each continent that are at highest risk of extinction. Objectives: The main aim of t...
Article
Recent phylogenetic analyses of the moss family Polytrichaceae have identified a clade of generally small-sized species exclusively distributed in southern temperate regions and the New World tropics. This group is sister to all other species in the family that have the characteristic polytrichaceous toothed peristome and epiphragm structure, with...
Article
Full-text available
Two American species of moss, Ephemerum homomallum Müll. Hal. (Pottiaceae) and Torrentaria aquatica (A. Jaeger) Ochyra (Brachytheciaceae), are reported as new to Africa, based on collections from the Limpopo and Eastern Cape provinces of South Africa, respectively. These discoveries changed the phytogeographical status of both species, which now be...
Article
The 'Rand flora' is a biogeographical disjunction which refers to plant lineages occurring at the margins of the African continent and neighbouring oceanic archipelagos. Here, we tested whether the phylogeographical pattern of Exormotheca pustulosa Mitt. was the result of vicariance induced by past climatic changes or the outcome of a series of rec...
Poster
Full-text available
IUCN Red List criteria widely recognised to objectively assess extinction risk of species across taxonomic groups. Application of IUCN criteria requires the use of critical terms that are difficult to apply to clonal organisms such as bryophytes. We pragmatically define 'mature individuals', 'generation length' and 'severe fragmentation' building u...
Poster
Full-text available
We were proposing one main centre and three sub-centres of endemism in the bryoflora of southern Africa. These are: Southwestern Centre, and Kamiesberg, Outeniqua and Drakensberg sub-centres.
Article
Full-text available
In the Flora of southern Africa area, comprising the countries of South Africa, Namibia, Botswana, Lesotho and Swaziland, the moss family Sematophyllaceae consists of three genera ( Trichosteleum , Donnellia and Sematophyllum ) and nine species. Core sematophyllous taxa with collenchymatous exothecial cells, long rostrate operculum, linear leaf cel...
Article
Full-text available
Octospora conidiophora is described as a new species, based on collections from South Africa. It is characterised by apothecia with a distinct margin, smooth or finely warted ellipsoid ascospores, stiff, thick-walled hyaline hairs, warted mycelial hyphae and growth on pleurocarpous mosses Trichosteleum perchlorosum and Sematophyllum brachycarpum (H...
Article
Full-text available
The IUCN Red List is recognised as a robust system for assessing the risk of extinction to organisms, but there are difficulties in applying the criteria to bryophytes and other clonal and colonial organisms. Three critical terms are addressed-generation length, mature individual and severe fragmentation-and definitions given in order to facilitate...
Article
The volatile constituents of nine liverworts species (Asterella marginata, Dumortiera hirsuta, Fossombronia swaziensis, Marchantia pappeana, Marchantia polymorpha subsp. ruderalis, Pallavicinia lyellii, Plagiochasma rupestre, Riccia albolimbata and Symphyogyna podophylla) from South Africa were determined by gas chromatography. Where possible the v...
Article
Full-text available
Moss diversity in southern Africa is greatest in the Cape Fold Mountains of the southwestern Cape, and the Drakensberg mountains along the Great Escarpment of KwaZulu-Natal, Mpumalanga and Limpopo Provinces of South Africa. Five main, and five secondary centres of moss diversity are described, based on the number of moss species per half degree gri...
Article
This delicate epiphytic moss is frequently encountered in woodlands or savanna areas of South Africa.
Conference Paper
Liverworts (Marchantiophyta) are considered to be the oldest terrestrial plants. At present more than 1500 terpenoids and 350 aromatic compounds (excluding flavonoids) have been isolated from or detected in the Marchantiophyta [1]. Several of these constituents are unique to liverworts and exhibit interesting biological activities, including antiba...
Article
Full-text available
The widespread southern African species, Metzgeria consanguinea, M. furcata and M. leptoneura (Metzgeriaceae) are revised, illustrated and their geographical distributions mapped. Metzgeria furcata is newly reported from Lesotho, and the Free State and Gauteng Provinces of South Africa.
Poster
Full-text available
The Flora of southern Africa (FSA) area, comprising the countries of South Africa, Namibia, Botswana, Lesotho and Swaziland, contains about 520 species of mosses. The numbers of moss species per ½ degree grid square, obtained from SANBI’s PRECIS database, were plotted on a map of the region. It shows that mosses are not uniformly distributed throug...
Article
The relatively large brood-bodies on the leaves of Syntrichia papillosa are visible with the naked eye or through a hand-lens.
Conference Paper
Full-text available
Plagiochasma rupestre is a rare thalloid liverwort species. Plagiochasma rupestre is reported to produce elemane sesquiterpenoids, of which (A)elema-1,4(15),11-trien-3,4-olide and elema-1,4(15),11-trien-3-al (422) have been identified as major components (Harrison et al., 1992) (similarity structures)
Article
Full-text available
Of the seven species that occur in southern Africa, Metzgeria quadrifaria and M. saxbyi are endemic to mainland Africa and M. madagassa and M. nudifrons are also known from the East African Islands. Metzgeria madagassa and M. quadrifaria are described, illustrated and distribution maps provided. Metzgeria nudifrons is newly reported from Gauteng an...
Article
Although the number of invasive bryophytes is much lower than that of higher plants, they threaten habitats that are often species rich and of high conservation relevance. Their potential of spread has, however, never been determined. Here, we assess whether the three most invasive bryophyte species shifted their niche during the invasion process a...
Article
Wardia hygrometrica is an aquatic moss restricted to the mountains of the southwestern Cape. It belongs to the Wardiaceae, the only endemic moss family in South Africa
Article
Full-text available
During a revision of the Sematophyllaceae for the Flora of Southern Africa project, we found a new species of Sematophyllum. Aquatic with poorly developed alar region, it is one of the biggest of the genus in southern Africa. It is only known from the Afromontane region and is not particularly threatened inasmuch as it occurs in a number of protect...
Article
Full-text available
alpestris (Thed.) Schimp. Contributor: L. Thouvenot Andorra: Encamp, Ensagents, 42u319070N, 1u389410E, 2520 m a.s.l., on the top of granitic rock in alpine meadow, 17 July 2006, leg. L. Thouvenot 3086 (BCB 58238). According to Casas (2005) this species was pre-viously unrecorded in Andorra (Eastern Pyrenees) although it is known in the neighbouring...
Article
Full-text available
This is the first of several projected articles on the taxonomy of southern African Metzgeriaceae H. Klinggr. A brief history of the genus Metzgeria Raddi in southern Africa, the only local representative, is presented. Family and genus descriptions, as well as a key to the species, are provided. Of the seven species currently recognized in souther...
Article
Trichostomum brachydontium is the most widespread and frequently collected moss in South Africa
Article
The attractive red-brown spore-bearing part of the plant (sporophyte), which consists of a long, twisting stalk (seta) with an asymmetrical, grooved capsule at the tip, makes Funaria hygrometrica easy to find and identify.
Article
Dicranella hookeri, a pan-south-temperate species, is recorded for the first time from continental Africa, based on material collected on the Highveld of the Free State and Mpumalanga Provinces of South Africa. Bryum bartramioides, an invalidly published name, is placed in synonymy of Dicranella hookeri. A brief description as well as notes on the...
Article
Bucklandiella lamprocarpa (Müll.Hal.) Bednarek-Ochyra & Ochyra is the only rheophytic representative of the genus in South Africa. Although this distinct and almost unmistakable species is bipolar in distribution, it is mostly an austral cool-temperate species ranging northwards along the alpine belts of South America and Africa. Examples are given...
Article
Full-text available
Exsiccatae in the bryophyte collection of the National Herbarium in Pretoria (PRE) are catalogued for the first time. Most of the 66 series represented in PRE were issued in Europe, but the USA is the country from which the largest number of exsiccatae originated. The exsiccatae span 3 centuries, with the earliest specimens issued in 1845 and the l...
Article
Two taxa currently recognised in Thuidium are transferred to Pelekium to complete the relocation of monoicous species from Thuidium subg. Microthuidium to Pelekium. The new combinations are: Pelekium thomeanum (Broth.) Phephu stat. et comb. nov. (basyonym Thuidium involvens (Hedw.) Mitt. var. thomeanum Broth.), now recognised as a species distinct...
Article
Full-text available
There is a high degree of correspondence between the bryoforistic regions of southern Africa and phytochoria based on the distribution of seed plants, especially those of White and Linder. The bryofloristic classification provides evidence for a greater Afromontane Region that includes the Cape Floristic as well as the Maputaland-Pondoland Regions,...
Article
Full-text available
New liverwort distribution records in South Africa.
Article
Polytrichum commune is one of the largest mosses in southern Africa and can grow up to 25 cm high. Its stiff, narrow leaves are spirally arranged at right angles to the wiry stem, giving the plant a star-like appearance when viewed from above.
Article
A TWINSPAN classification divides the moss flora of southern Africa (South Africa, Namibia, Botswana, Swaziland, and Lesotho) into two main bryofloristic elements: (1) the Xerophytic (south-western) element mainly distributed in the winter rainfall and semi-arid to arid, temperate areas of southern Africa, and (2) the Mesophytic (subtropical) eleme...
Article
A TWINSPAN classification divides southern Africa (South Africa, Namibia, Botswana, Swaziland and Lesotho) into two main bryofloristic regions: (1) a subtropical or palaeotropical region in the northern, eastern and southern parts, characterised by a predominantly mesophytic moss flora; and (2) a temperate or austral region in the central and weste...
Chapter
New checklist of South African mosses.
Chapter
New checklist of southern African mosses.
Thesis
Thesis (Ph. D.)--University of Pretoria, 2000. Includes bibliographical references.
Book
Full-text available
The following text constitutes Fascicle 3 of Part 1 of Volume Bryophyta in the Flora of southern Africa Cryptogam series. This fascicle includes the families Erpodiaceae to Hookeriaceae (see Conspectus of classification, p. 445). Several inadequacies of the traditional classification system used for this Flora (see Fascicle 1, p. 13) are evident in...
Article
In southern Africa the subfamily Macromitrioideae (Orthotrichaceae) consists of four genera, 11 species, and one subspecies. The following taxa are recognised: Macrocoma, consisting of M. lycopodioides (Schwaegr.) Vitt, M. pulchella (Hornsch.) Vitt, and M. tenue (Hook. & Grev.) Vitt subsp. tenue; Macromitrium, consisting of M. lebomboense Van Rooy,...
Article
Two species of Amphidium Schimp. (Orthotrichaceae) occur in southern Africa. A. tortuosum (Hornsch.) Robinson and A. lapponicum (Hedw.) Schimp. are sympatric in the mountains of western Natal and Lesotho. A. tortuosum is also known from the south-western Cape. A. lapponicum is for the first time reported from the southern Hemisphere. Descriptions,...
Article
Two species of Rhabdoweisia B.S.G. are recognised for southern Africa: R. crispata (Dicks.) Lindb, is reported new to Africa and the distribution of R. fugax (Hedw.) B.S.G. is extended to include the eastern Transvaal. Original material of Bryum crispatum Dicks. in the Dickson Herbarium (BM) is selected as lectotype for the species. Illustrations,...
Article
Full-text available
Additions and alterations to the inventory of about 26 000 plant taxa in southern Africa are reported for the period from February 1990 to February 1991. In this period a total of 1 080 alterations have been recorded. These changes result from the continual surveying of taxonomic literature received by the library of the National Botanical Institut...
Article
Since the publication of the first fascicle of the moss Flora of southern Africa (Magill 1981), several new and interesting records have been identified from geographical regions referred to in the fascicle. Most of the new records are a result of recent collecting by the authors and other staff members of the National Botanical Institute. However,...
Article
Full-text available
Additions and alterations to the inventory of approximately 25 000 southern African plant taxa are reported for the period from February 1989 to February 1990. In this period, a total of 890 alterations have been recorded. These changes result from the continual surveying of taxonomic literature received by the library of the National Botanical Ins...