Psathyrella amarescens Arnolds 2003
in Fungi Non Delineati XXVI: 4

MycoBank: 538206
Basionym: Psathyrella amarescens Arnolds 2003 l. c.
Original diagnosis:
"Pileus 7-30 mm latus, obtuse conicus vel conico-campanulatus, dein conico-convexus, hygrophanus, in udo vinoso-brunneus vel purpureo-brunneus, striatus, in sicco pallide rufo-brunneus vel griseo-rufus, centro ochraceo, velum nullus. Lamellae subconfertatae, adnatae, ad 5 mm latae, pallide griseo-brunnea, acie floccosae, obscure badiae vel nigrae. Stipes 30-85 x 0.7-3 mm, cylindrceus, fistulosus, radicatus, pseudorhiza 10-30 mm longus, albus pallide ochreceus, apice pruinosus. Caro pileo concolor, stipitis albus. Oder raphanaceus, sapor amarescens, raphanaceus. Sporae 12.0-14.5 x 6.0-7.0 Ám, nec lentiforma, ellipsoideae-oblangae vel subamygdaloideae, pallide rufo-brunneae, nec opacae, poro germinativo distincto munitae. Basidia 20-25 x 10-12 Ám, 4-sporigera. Acies lamellarum substerilis. Cellulae marginales: cheilocystidia pleurocystidioidea numerosa, 32-61 x 7.5-14 Ám, lageniformia vel fusiformia, hyalinia vel brunnea, cystidia clavata et utriformia intermixta, numerosa, 17-33 x 6.0-11 Ám, crassi-tunicata, brunnea, cellulis spheropedunculatis et clavatis hyalinis intermixta, 12-23 x 6.5-9.5 Ám. Pleurocystidia sat numerosa, 38-67 x 11-17 Ám, lageniformia. Pileipellis hymenidermiformis, cellulis 31-56 x 16-41 Ám. Caulocystidia lageniformia, interdum subcapitatae, 33-47 x 9.5-13 Ám, cellulis clavatae intermixta, 18-32 x 6.5-13 Ám. Fibulae frequentes. Habitat: gregerius ad ramenta lignis, terram humosam intermixtam, autumno."

Type: The Netherlands, Beilen, Holthe, "Schepping", 3 Oct. 2002, E. Arnolds no. 02-78 (L)
Important synonyms: None known.

Select. descript.: Arnolds (2003): 4ff., Friebes & Melzer (2009): 53ff.
Select. icons: Arnolds (2003): 35, Friebes & Melzer (2009): 57.

Macrocharacters:
Pileus up to 15 mm broad, conically-campanulate with broad umbo, strongly rugolose, center and margin ochre, other pink to reddish, moist striated. Veil practically absent.
Lamellae close to moderately distant, adnate, withish to pale grey brown, with a pink tinge, edges without contrast.
Stipe 30-85 x 0,7-3 mm, whitish to brownish, shiny, paex pruinose, base slightly thickened, undistinctly to distinctly pointed, tomentose.
Microcharacters:
Spores 10-14,5 x 5-7 Ám, av. 11,5-12,9 x 5,8-6,6 Ám, av. Q=1,90-2,02, ellipsoid, slender ovoid. Immature spores congophil, in water, ammonia and KOH colourless, without visible germ pore. Mature spores pale reddish brown, with distinct, large germ pore.
Basidia 20-38 x 8-12 Ám, usually very long-stemmed, 4-spored.
Cheilocystidia 23-61 x 6,8-14 Ám, lageniform to fusiform, frequently, not crowded, near the margin of cap only scatterd. Undermixed with numerous clavate and irregular marginal cells, 11-33 x 4-11 Ám, mostly in 55-140 Ám wide clusters, often with slightly thickened walls. Gill edges ca. 10-15 Ám wide pale yellow-brown pigmented, with gaps.
Pleurocystidia 38-70 x 9,5-17 Ám, very frequently, lageniform and fusiform, mostly slender, apex narrow.
Clamps present.
Habitat: Grassland, humus-rich soil, wood chips.
Distribution: Netherlands, Austria
Remarks:
The taste is bitter as mentioned by Arnolds (2003). The spores mature very slowly, are then light brown in color and show a germ pore (Arnolds, pers. comm.). Probably it is a weak pigmented variety of Psathyrella corrugis, in addition to which there are no significant differences.
Coll. exam.:
(A) Herbersteinklamm, 11.10.08, leg. G. Hahn (GJO 27.299/113).

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