199 research outputs found
Studies in the genus <i>Riccia</i> (Marchantiales) from southern Africa. 20.,<i>R. albovestita</i> and its synonyms, <i>R. duthieae</i> and <i>R. sarcosa</i>
No full textAs has been repeatedly emphasized elsewhere, species in section Pilifer Volk are often very difficult to distinguish (Perold 1990b, 1990c). This is nowhere better illustrated than in the case of R duthieae Volk & Perold and R. sarcosa Volk &Perold. both initially described as new species, which are now regarded by me as synonyms of R. albovestita Volk. Comparisons are drawn between the thallus dimensions, dorsal cell pillars, spore ornamention and other characters, in support of the above conclusion. An updated distribution map and a list of the specimens examined are added, because several new collections have been made since the original publications
Studies in the liverwort genus <i>Fossombronia</i> (Metzgeriales) from southern Africa. 8. <i>F. elsieae</i> and <i>F. spinosa</i>, two new Western Cape species with spinose spores
No full textTwo new species with spinose spores are described from the Western Cape. F. elsieae Perold is quite a large plant, generally with almost entire leaves, its spores on the distal face having relatively few, rather coarse spines, which often appear broken and are occasionally linked to form abbreviated ridges. F. spinosa Perold is a smallish plant with irregularly lobed leaves, its spores on the distal face having numerous, fine spines, which sometimes coalesce to form short ridges. A table which compares F. glenii Perold, F. leucoxantha Lehm. and F. montaguensis S.W.Arnell with the two new species, is supplied
Studies in the liverwort genus <i>Fossombronia</i> (Metzgeriales) from southern Africa. 6. New species from Lesotho, Swaziland and Mpumalanga and new records from Lesotho
No full textTwo new species of Fossombronia are described: F. angulifolia Perold from Lesotho and F. swaziensis Perold from Swaziland and Mpumalanga. F. angulifolia is characterised by erect or semi-erect, 2-4-lobed, angular leaves, by mostly incompletely reticulate spores and by rather short elaters F. swaziensis can be recognised by large, rounded or sometimes shallowly notched leaves, which are rather stiff and bi- to multistratose basally, by quite large perigonial bracts in the male plants and by spores which have irregular areolae containing tubercular inclusion
Studies in the genus <i>Riccia</i> (Marchantiales) from southern Africa. 15. <i>R. hirsuta</i> and <i>R. tomentosa</i>, sp. nov., two distinct species previously treated as one
No full textThe description of Riccia hirsuta (Volk & Perold 1986) is emended and new illustrations of the species are provided, as the original description and illustrations were based on two distinct, but rather similar species. Examination of newly collected material of R. hirsuta, showed it to belong to subgenus Riccia, section Pilifer (Volk 1983). Section Micantes (Volk & Perold 1986) of which this was the type species, is therefore transferred to section Pilifer. R. tomentosa Volk & Perold, sp. nov., described here, is at first glance somewhat similar to R. hirsuta in its habit, hence the earlier confusion in Volk & Perold (1986). It also resembles R. hirsuta in its dorsal covering of long hairs and in the triangular scales apically split into cellular strands. R. tomentosa, however, differs from R. hirsuta in the spongy (not compact) construction of the thallus and in the spores permanently united in tetrads (not single). It belongs to subgenus Thallocarpus and is the type species of the new section Pannosae
Studies in the Marchantiales (Hepaticae) from southern Africa. 2. The genus <i>Athalamia</i> and <i>A. spathysü</i> ; the genus <i>Oxymitra</i> and <i>O. cristata</i>
No full textThe genera Athalamia (Cleveaceae) and Oxymitra (Oxymitraceae), each respectively represented in southern Africa by a single species, A. spathysü (Lindenb.) Hattori and O. cristata Garside ex Perold, are discussed
Studies in the genus <i>Riccia</i> (Marchantiales) from southern Africa. 3. <i>R. schelpei</i>, a new species, in the new subgenus <i>Chartacea</i>
No full textRiccia schelpei Volk & Perold, sp. nov., endemic to the western Cape, is described. It is characterized by the parchment-like epidermis of the thallus, thick-walled hyaline epidermal cells and by dorsal air-pores encircled by a raised ring of smaller thin-walled cells. This species is the type of the new monotypic subgenus Chartacea Perold
Studies in the genus <i>Riccia</i> (Marchantiales) from southern Africa. 26. A new species in section Pilifer, <i>Riccia radiata</i>, is described
No full textRiccia radiata Perold, a new species endemic to southern Africa, is described. It is referred to section Pilifer O.H.Volk, which is characterized by the dorsal epithelium of the thalli consisting of short or long, free-standing, hyaline cell pillars
Studies in the genus <i>Riccia</i> (Marchantiales) from southern Africa. 6. <i>R. hirsuta</i>, a new species, in a new section
No full textRiccia hirsuta Volk & Perold, sp. nov., the type species of a new section, Micantes Volk & Perold, subgenus Spongodes (Nees) Volk is described. It is characterized by tall, dorsal, hair-like, multi-cellular outgrowths from an epidermis with distant air-pores, leading to polyhedral air-chambers below, and is the only species in this subgenus with these outgrowths. The ventral scales are triangular, apically splitting into long, hair-like appendages. This species is endemic to the north-west and central Cape Province
Arnell, Marchantiales, Riccia albolimbata, R. albosquamata, white scales
No full textArnell s (1957. 1963) inadequate descriptions, poor drawings, mistakes in the text and key. as well as mixed collections, have all contributed to the confusion regarding the identity of his species R albolimbata and R albosquamata. Volk s collections (Arnell 1957) of the latter consist mostly of two white-scaled species in the same packet: one is R. albolimbata and the other is R argenteohmbata Volk & Perold (Volk et al. 1988). Evidently Amell used characters of both plants to describe R. albosquamata. although the type specimen. Volk 452. consists of only R albolimbata (plus fragments of R atropurpurea Sim and R. trichocarpa Howe). R albosquamata is accordingly to be regarded as a taxonomic synonym of R albolimbata
Studies in the liverwort genus <i>Fossombronia</i> (Metzgeriales) from southern Africa. 11. <i>F. zuurbergensis</i>, a new species from Eastern Cape and new records for the area
No full textFossombronia zuurbergensis Perold, sp. nov. from Eastern Cape is described. It is distinguished by having leaves and
pseudoperianths with markedly dentate margins; the spore ornamentation on the distal face consists of ridges which can be
quite variable, although, at least some of them run parallel to each other in straight or curved, short or long ridges, others
occurring at right angles to the former. New records for F. capensis var. capensis and F. crispa are reported for Eastern Cape
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