Search on : Taxa descriptions

 


   
Literature:
 
Page number:121 
Remarks (internal):Nolanea acuta is distinguished by its combination of relatively large basidiomata, a dark yellowish brown acutely umbonate pileus, clavate stipe with brownish longitudinal fibrils on a whitish ground, heterodiametric basidiospores averaging 9.7 x 6.7 µm (Q = 1.4), cytoplasmic pigmentation, and lack of hymenial cystidia. Rhodophyllus acutus from Gabon (Romagnesi & Gilles 1979) is morphologically identical to Guyanese N. acuta, justifying the new combination. The discovery of N. acuta in Guyana constitutes a significant intercontinental range extension for the species.
Nolanea acuta is similar to N. solstitialis (Fr.) P.D. Orton [≡ Entoloma solstitiale (Fr.) Noordel.] in pileus and stipe size, shape, and colors, basidiospore shape and size, and lack of cheilocystidia, but N. solstitialis can be distinguished by its translucent-striate hygrophanous pileus and smooth glabrous stipe (Noordeloos 1980, 1992, 2004).
Because of its basidioma colors, acutely umbonate pileus, and lack of cheilocystidia, Nolanea acuta resembles members of a species complex centered around N. papillata Bres., including N. pseudopapillata Pegler [= N. papillata sensu Dennis. non Bresadola], N. mammifer (Romagn.) Pegler [≡ Rhodophyllus mammifer Romagn.], and N. apiculata Petch [≡ Entoloma acuminatum E. Horak]. All these species differ from N. acuta primarily by their externally encrusting pileipellis pigments (Dennis 1970; Horak 1980; Pegler 1983).

 
Description type:Non-original description 
Description:Nolanea acuta (Romagn. & Gilles) Largent, comb. nov. Plate 1
Mycobank MB 519978
≡Rhodophyllus acutus Romagn. & Gilles, Beih. zur Nova Hedwigia 59: 542 (1979)
Pileus 21-32 mm broad, broadly convex with acute umbo; umbo and part of surrounding disc dark yellowish brown (5F8) because of appressed radial fibrils, background color lighter, maturing overall to light blond (4C3), nonhygrophanous; margin slightly inturned, somewhat rimose-frayed, not striate or translucent-striate. Lamellae subclose, subthick, very finely adnexed, becoming pinkish from spores (6B4); lamellulae 3 between lamellae, in 2 tiers. Stipe 70-85 x 3 mm wide at apex, 6 mm at base, tapered upward, whitish with appressed brown longitudinal fibrils. Basal mycelium scant, white, appressed felty. Stipe context white, stuffed. Odor and taste none.
Basidiospores distinctly 5-7-angled in profile, dorsal and ventral views, heterodiametric in all views, 7.8-11.3 x 5.2-7.5 µm (mean = 9.7 ± 0.83 x 6.7 ± 0.59 µm; E = 1.3-1.8, Q = 1.43 ± 0.09; n = 30); hilar appendage distinct. Basidia clavate, slightly to strongly tapered at the base, 27.7-33.1 x 7-10 µm (mean = 30.2 ± 1.8 x 8.6 ± 0.88 µm; E = 3.0-4.4, Q = 3.53 ± 0.30; n = 11), 4-sterigmate. Cheilocystidia and pleurocystidia absent. Lamellar trama of longcelled, parallel to subparallel hyphae (not measured). Pileipellis a cutis of uninflated hyphae that are 3.2-10.7 µm wide and rarely uplifted; terminal cells cylindric to cylindro-clavate, 33.6-73.8 µm long. Pileus trama hyphae inflated beneath the pileipellis, 5-20 µm wide, elsewhere 5-40 µm wide. Stipitipellis a cutis; hymenial clusters and caulocystidia absent. Pigmentation uniform, light to medium brown in the cytoplasm of the pileipellis; incrusted hyphae absent. Refractive hyphae abundant in the pileus trama. clamp connections absent. Microchemical reactions in Amman’s solution: hymenial elements strongly cyanophilic.
Ecology, range, distribution - Scattered on soil in Dicymbe corymbosa forest in the Upper Potaro River Basin of Guyana; originally described from
Gabon.
 
Taxon name: