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Syrrhopodon perangustifolius (Musci; Calymperaceae) comb. et stat. nov., and New to the Flora of Colombia

1998; American Bryological and Lichenological Society; Volume: 101; Issue: 1 Linguagem: Inglês

10.1639/0007-2745(1998)101[153

1938-4378

William D. Reese, Steven P. Churchill,

Lichen and fungal ecology

Syrrhopodon perangustifolius (Reese) Reese (Basionym: Syrrhopodon incompletus Schwaegr. var. perangustifolius Reese) is recognized at the specific rank following the discovery of a third specimen of this rare endemic of northwestern South America. This distinctive moss is reported new to the Colombian moss flora. Syrrhopodon perangustifolius is contrasted with its closest relative, S. lanceolatus (Hampe) Reese, and both species are illustrated. A key to the taxa of S. incompletus s.l. is provided. Syrrhopodon perangustifolius was originally described as a new variety of S. incompletus Schwaegr. based on one specimen each from Ecuador and Peru (Reese 1977). Since that time no further collections of this moss were known until a specimen of the species was recognized among recent collections from Colombia (Antioquia, Mpio. Amalfi, 950-1,100 m, 7005'N, 74o56'W, R. Callejas, J. Betancur & O. Escobar 9237, HUA, LAF, MO). This specimen (Fig. 1-2) is a new record for the Colombian moss flora (Churchill & Linares C. 1995). The new collection of this rare moss, the first since 1910, reaffirms its distinctive qualities and suggests that it should be recognized at the level of species. SYRRHOPODON PERANGUSTIFOLIUS (Reese) Reese, comb. et stat. nov. BASIONYM: Syrrhopodon incompletus Schwaegr. var. perangustifolius Reese, THE BRYOLOGIST 80: 13. 1977. Syrrhopodon perangustifolius is characterized by its leaves 5-8 mm long and spreading-flexuous both wet and dry, by the narrowly linear, gently recurved, upper lamina that is abruptly constricted above the broad flaring shoulders, and by the leaf base 1.3 mm wide at its broadest point. In contrast its closest relative, S. lanceolatus (Hampe) Reese (Fig. 3-4), has leaves mostly 3-5 mm long, mostly erect-appressed when dry and scarcely changed when wet, with the upper lamina usually straight and tapering to the base, which is 0.7-1.1 mm wide at its broadest point. Other than in length, the leaves of the two species are basically quite similar. The sporophyte of S. perangustifolius lacks a peristome in the one fertile specimen known (Spruce 5, NY), but sporophytes of S. lanceolatus are peristomate (Reese 1993). In transverse section, the thickened leaf margins of both S. lanceolatus and S. perangustifolius usually show at least a few stereids, sometimes many (Reese 1977, 1993). The leaves of the Colombian specimen are a little less spreadingflexuous than in those from Ecuador and Peru, but are otherwise very similar. Based on the three collections known, S. perangustifolius occurs on bark at moderate elevations, at 950-1,100 m for the Colombian specimen reported here and 1,200 m for the Ecuadorian collection. The elevation for the Peruvian specimen, collected by Richard Spruce, is not known. The Amalfi region, and G6mez Plata somewhat to the south of Amalfi, may represent portions or outliers of the Nechi refugium (Haffer 1969; = Rio Magdalena Cauca of Prance 1982). This region may represent a refugium; it contains a diverse vascular flora, and several interesting mosses have recently been collected from there, including from Amalfi, Floribundaria usneoides Broth. and Squamdium macrocarpum (Mitten) Broth., and from G6mez Plata, Calyptothecium planifrons (Renauld & Paris) Argent and Syrrhopodon cymbifolius J. K. A. Miller. KEY TO TAXA OF SYRRHOPODON INCOMPLETUS