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Remarks (internal):Pouzarella debilis is diagnosed by small fragile basidiomata (pileus 5 mm broad, stipe 15 x 0.5 mm), a hispid-squamulose pileus at first with off-white squamules that are erect on the disc and elsewhere suberect over a medium to dark grayish-brown base color and in age becoming striate from the margin inwards and fading to light grayish-brown, aborted basidia that project slightly beyond the hymenium, absence of cheilocystidia, caulocystidia resembling the pileocystidia, and basidiospores averaging 10.4 x 6.3 µm, (Q = 1.67). The macro- and micro-morphological features of the Australian collection P. debilis are nearly identical with those described for Pouzaromyces debilis from Papua New Guinea and the Solomon Islands (Horak 1980).
Pouzarella domingensis T.J. Baroni from the Dominican Republic and P. dunstervillei (Dennis) Mazzer have moderate-sized basidiospores and lack cheilocystidia, features also noted for P. debilis. Pouzarella domingensis differs in the lack of light-colored squamules in young pilei, inflated subpellis hyphae, and larger basidiospores averaging 11.0 x 7.6 µm (Baroni et al. 2008), while P. dunstervillei (which also lacks light-colored squamules in young pilei) has a nearly glabrous pileus and stipe (Mazzer 1976). Pouzarella pulverea (Rea) Mazzer from Great Britain and the Netherlands, Entoloma romagnesii Noordel. from France, and E. lomapadum Manim. et al. from India also have similarly sized basidiospores, but all three lack light-colored squamules in the young pilei and possess thin walled cheilocystidia (Mazzer 1976, Manimohan et al. 1995, Noordeloos 1979, 2004).

See P. setiformis for comparisons with other Australian entolomatoid fungi similar to P. debilis.
 
Description type:Non-original description 
Description:Pouzarella debilis (Corner & E. Horak) Largent & Abell-Davis, comb. nov.
MycoBank MB 519572 Plates 13-14
? Pouzaromyces debilis Corner & E. Horak, Beih. Nova Hedwigia 65: 42 (1980).
Pileus 5 mm broad, 4 mm high, convex, at first entirely opaque and hispidsquamulose with the squamules off-white (5A-B1-2) and erect in the center, suberect elsewhere, base color of the center grayish-brown (6F3-4) and elsewhere slightly lighter grayish-brown (6E-F3-4) when faded remaining so on the disc but becoming appressed squamulose and striate to the margin, elsewhere with the base color light grayish-brown (near 6C3-4) and the striae darker grayish-brown (6E3-4), dry, dull, not hygrophanous, even; margin decurved, minutely fringed and crenulate at the very edge of the margin. Taste and Odor unknown. Lamellae 7.5 mm long, uncinate with a short decurrent tooth, close to subdistant, narrow (1 mm deep); margin smooth and concolorous. Lamellulae very short, commonly 1, infrequently 3 (all short) between 2 lamellae. Stipe 15 mm long, 0.5 mm broad, equal, on the surface with loosely entangled fibrils or scattered pruina, obvious at the apex and base, inconspicuous elsewhere, surface fibrils similarly colored to those of the pileus, base color grayish-orange (6B-C3-4) and upon handling the base bruises a grayish-brown (6E3-4), hollow and fragile because of size. Bruising reaction absent.
Basidiospores nodulose-angular with 6-8 angles, heterodiametric in profile view, isodiametric and 6-angled in polar view, 8.7-12.0 x 5.0-7.4 µm, (xm = 10.44 ± 0.8 x 6.3 ± 0.6 µm; E = 1.36-2.27; Q = 1.67 ± 0.22; n = 29/1). Basidia 4-sterigmate, clavate, tapered, 27.6-36.5 x 8.9-12.8 µm, (xm = 31.8 ± 2.7 x 11.1 ± 1.2 µm; E = 2.33-3.49; Q = 2.88 ± 0; n = 10/1). Cheilocystidia absent. Pseudocystidia absent. Aborted basidia abundant on the gill edge and face, colored reddish-brown in 3% KOH, often with 1-2 sterigma and aborted basidiospores, slightly projected beyond the hymenium, 33.6-46.8 x 7.4-11.6 µm. Hyphae of lamellar trama subparallel, moderately long, narrow to fairly wide, 184.9396.8 x 6.2-30.8 µm. Pileipellis with scattered, entangled hyphae composed of chains of 3-5 cells, subpellis without inflated cells, hyphae similar to pileal trama. Pileocystidia broadly cylindro-clavate 35.1-58.4 x 9.7-20.0 µm (E = 2.49-4.10; Q = 3.2). Stipitipellis with scattered areas of clustered hyphae similar to those of the pileipellis, 29-103 µm long, a cutis between the clusters. Caulocystidia similar to pileocystidia, 20.7-54.4 x 7.0-16.5 µm (xm = 34.9 ± 10.6 x 11.6 ± 2.7 µm; E = 1.82-6.41; Q = 3.14 ± 1.31; n = 16/1). Pigmentation moderately externally incrusted in the trama of the pileus, stipe and lamellae; parietal in the form of minute to moderate internal incrustations in the hyphae of the stipitipellis and pileipellis.
Ecology and distribution: Solitary in dark crumbly soil on an open hillside in complex mesophyll vine forest of cloudy to moist highlands on granite; Mt. Hypipamee National Park. Previously reported from Papua New Guinea and the Solomon Islands.
 
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