Search on : Taxa descriptions


Description type:Original description 
Description:Ramaria largentii sp. nov. (P1. VE Fig. 33, P1. XXVIII Fig. 96)
Holotypus M-439 ad rivulum Tahoma prope montem Rainier in comitato Pierce pagi washingtoniaci 10/9/66 lectus, in herbario SUCO conservatus.
Basidiocarp: Habitat: terrestrial, collected under Lowland Hemlocks. Color: base of fresh fruiting body white to "pale yellow" (4A3), branches "light orange" (5-6A4-5), concolorous or more intensely colored towards the apices, about "Persian orange" (5-6A6-7). context of the stipe white, the subsurface of branches concolorous becoming lighter towards the center. Dried specimens mostly "grayish orange" (5B5), the base more grayish and the context paler. Taste: not distinctive. Odor-slightly sweet. Form: basidiocarps of medium size, broad, 12-15 x 7-14 cm. Base 4 x 5 cm (M-439), single or subfasciculate, cylindrical or broadly conical, with a basal tomentum, small abortive branches frequently diverging from the upper base; branching up to 9 times from the base, mostly polychotomous in the lower nodes and dichotomous above, axils subacute to u-shaped, branches subparallel to moderately divaricate, internodes of mature specimens elongated, the lower ones up to 4 cm long, branches slender, generally less than 1 cm in diam, bifid to multifid near the apices; apices rounded. Consistency: fleshy-fibrous when fresh, drying brittle with chalky-friable properties.
Macrochemical Reactions. Context of the stipe non-amyloid; significant color changes occurring within 30 min of application to branch sections of a-napthol and guaiac, guaiacol sometimes weak; no significant color reactions occurring with pyrogal1ol, phenol, and ani1ine.
Microscopic structures: Spores: average 13.4 x 4.5 µm, range 11-15 x 3.5-5 µm, subcylindrical, ornamented with conspicuous, irregularly shaped, cyanophilous warts in subspirals, spores "golden yellow" (5B7) in deposit. Hymenium: basidia clavate, 65-102 x 9-13 µm, basally clamped, mostly 4-sterigmate; sterigmata 3-8 µm long, incurved or straight, slightly divergent; hymenium 65-110 µm thick, and the subhymenium about 25 µm thick. Subhymenial hyphae: compactly interwoven, 2.5-5 µm diam, clamped, thinwalled. Contextual hyphae: a loosely interwoven tomentum covering stipe, cells 2.5-3.5 µm diam, context of the stipe compactly interwoven with lysed areas (?), parallel in the branches, cells non-inflated to moderately inflated, 4-15 µm diam, walls smooth, cyanophilous, thin-walled, occasionally hyphae ampulliform near septa, 7-20 µm diam, walls of the swellings slightly ornamented in the stipe; clamps less abundant in the context than in the subhymenium, the clamp cell sometimes enlarged to about 7 µm;gleoplerous hyphae common, 2.5-4 µm diam or up to 9 µm diam in localized bulbous regions.
Discussion: The single most striking feature of this species is the large, grossly ornamented spores that average 13.4 x 4.5 µm. This one characteristic clearly delimits R. largentii from other bright orange ramarias with clamped hyphae with which it might otherwise be confused. Approaching R. largentii in spore size and color of the fruiting body is R. longispora, a species without clamp connections. Ramaria longispora differs further in its Blender habit, compound base, and negative reactions with a-napthol and guaiac.
Ramaria largentii may be C. aurea Schaeff. per Fries in the sense of Bresadola. In NCU is a specimen collected and determined by Bresadola as C. aurea, 'typica' (1901, Sopramento) which is microscopically identical to collection M-439. Ramaria largentii has the massive base, dense tuft of branches, clamped hyphae, and fleshy-fibrous consistency usually associated with R. aurea. Nevertheless, the spores are too large and too conspicuously ornamented, and the coloration of the fruiting bodies too orange to fit the concept of most authors, including Fries, 1838; Karsten, 1876; Quelet, 1888; Ricken, 1918; Bourdot & Galzin, 1927; Corner, 1950. In 1923 Coker pointed out that great confusion surrounded the epithet, C. aurea. Unfortunately, this is still true today.
Taxon name: