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Page number:30 
Description type:Non-original description 
Description:Lentinus concavus (Berk.) Corner comb. nov.
Panus concavus Berk., Ann. Mag. nat. Hist. 2 (1852) 9.
Pleurotus concavus (Berk.) Singer, Sydowia 9 (1955) 377; Dennis, Fung. Fl. Venezuela (1978) 47.
Clitocybe augustinensis Singer, Mycologia 47 (1955) 766; Sydowia 9 (1955) 377. Cheilocystidia -35 x 4-7 µm clavate or subcylindric, often slightly lobed or flexuous, as sterile basidia on the sterile gill-edge.
Hyphae dimitic with skeleto-binding cells; generative hyphae 37 µm wide, clamped, not or little inflated; skeletal cell-body 300900 µm long, narrowly fusiform, 5-10 µm wide in the middle, 4-7 µm at the ends, straight or flexuous, persistently with the walls slightly thickened -0.5 gm (-2 µm at the base of the stem), with a distal forward process and a proximal backward process, rarely with a lateral process, the binding processes -400 µm long, tapered to thinwalled filiform tips 1 µm wide, simple or 1 (-2) times furcate.
Gill-trama with radiate construction. Surface of pileus with appressed generative hyphae 2-5 µm wide, with a few abortive processes to the exterior. Hyphal pegs minute, abundant in some collections.
This differs from L. striatulus as follows:
1. Caespitose fruit-bodies with rather slender and elongate stems connate in a thickened and cushion-like base 2-3 cm wide.
2. The glabrous pileus and stem.
3. The skeletal cell-body with persistently wide lumen, and without intricately branched binding processes.
I have studied the types at Kew. C. augustinensis was said to grow on manure but the fruit-bodies of the type are attached to a piece of rotten wood, on which the manure must have fallen. The scales at the base of the stem, which Singer reported, are the abortive fruit-bodies of the caespitose clump. I collected the species in April and May from logs at Iquitos in Peru.
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