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 Add this item to the list  804384 Original description
   
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Remarks (internal):Phylogenetically E. rugosiviscosum clusters with several species including E. prunuloides (Fr.) Quel., E. albomagnum, and E. cretaceum. Excluding E. ochreoprunuloides Morgado & Noordel.), most of these species possess a tacky, sticky, subviscid, viscid, or glutinous pileus surface with an ixocutis- or ixotrichodermium-type pileipellis. Entoloma conspicuum E. Horak from Papua New Guinea resembles E. rugosiviscosum in its tricholomatoid basidiomata, brown rugose to subvenous pileus, and cuboidal basidiospores but differs by the cutis-type pileipellis and larger basidiomata (Horak 1976, 1980). Entoloma rugosostriatum Largent & T. W. Henkel from Guyana also has a brown rugose pileus and tricholomatoid stature but differs in its isodiametric nodulose basidiospores (Largent et al. 2008).

 
Description type:Original description 
Description:Entoloma rugosiviscosum Largent sp. nov Plates 8–9
MycoBank MB804384
Differs from Entoloma conspicuum by its smaller basidiomata, the radial rugose viscid pileus, brown stipe, and ixotrichodermium.
Type: Australia, Queensland, Cook region, Daintree National Park, Tribulation section, Marrjda Track, within 20 m of 16°08′18.5″S 145°26′26.0″E, 20 March 2009, DL Largent 9676 (holotype BRI, isotype CNS).
Pileus 55–75 mm broad, 15 mm high; not hygrophanous, not striate, and not translucent; broadly convex and umbonate; shiny, viscid and sticky to the touch and remaining so 14 hours after collecting; scummy on the disc, radially-rugose elsewhere; medium dark yellow brown (5E-F5) on the disc and brownish orange to light brown (5C-D4–5) elsewhere, eventually entirely greyish orange with age and fading; margin greyish orange (5B2–3), decurved and even, elastic, and extends past lamellae up to 2 mm; context solid, brownish beneath the cuticle, white elsewhere, 10 mm broad above the stipe apex, 1–1.5 mm at the margin. odor mild to mildly pungent. Taste mild. Lamellae 25–26 mm long, 11–13 mm deep; uncinate to adnexed, at times nearly free; white at first; subdistant, more or less ventricose and broad; margin smooth then eroded with age, concolorous. Stipe 50–51 mm long, 11–14 mm broad at the apex, 9.5–14 mm broad in the middle, 7–15 mm broad at the base, more or less clavate-tapered, white at first discoloring yellowish (3A2–3) with age and handling, minutely appressed-fibrillose; flesh white, fibrous-stuffed then hollow in the center with age. Bruising reactions basidiomata discoloring yellowish with handling.
Basidiospores typically cuboidal and distinctly angular in all views, rarely 5–sided, small, 4.8–7.0 x 4.1–6.6 µm (x = 5.8 ± 0.4 x 5.4 ± 0.5 µm; Q 0.87–1.25; E 1.07 ± 0.08; n = 52/2). Basidia 4-sterigmate, long and narrow, 33.1–44.7 x 6.4–9.7 µm (x = 38.1 ± 3.4 x 7.99 ± 1.1 µm; Q 3.76–6.23; E 4.85 ± 0.8; n=10/1. Sclerobasidia absent. Hymenial cystidia absent. Lamellar trama 318– 400 µm wide; subhymenium gelatinized and broad, 40–56 µm wide. Lamellar tramal hyphae subparallel to nearly parallel, short and broad, 38.5–102.2 x 12.7–17.6 µm. Pileipellis an ixotrichodermium with cylindric hyphae 2–3 µm diam., walls irregular and gelatinized. Pileal tramal hyphae subparallel, relatively short and broad, 61.2–133.5 x 15.2–31.0 µm. Stipitipellis a cutis but with solitary but scattered basidia-like cells at the apex. Stipe tramal hyphae nearly parallel, narrow in the outer portions, short and broad in central area and then 81.7–169.8 x 15.2–36.9 µm. Oleiferous hyphae abundant in the trama of the pileus, lamellae, and stipe. Brilliant granules and lipoid globules absent. Pigmentation cytoplasmic, brownish and uniform in the hyphae of the pileipellis. Clamp connections abundant and present in all tissues. Ecology & distribution: Solitary, humicolous, adjacent to the pavement on the Marrdja Track, 15–50 m from parking lot, Daintree National Park, Tribulation Section.
Distinctive characters: Radially rugose viscid yellow brown pileus that fades to brownish orange or light brown, white stipe discoloring yellowish, basidiospores mostly cuboidal and small (4.8–7.0 x 4.1–6.6 µm), an ixotrichodermium-type pileipellis, long narrow basidia.
 
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