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 Add this item to the list  816536 Original description
Remarks (public):The external morphology and microscopic details of the presently worked out collection match with the details given for Agaricus abruptibulbus Peck by Freeman (1979b), Møller (1952), Phillips (2001-2013), except that cheilocystidia are absent in our collection whereas cheilocystidia are abundant in A. abruptibulbus and spores are comparatively smaller in size in present collection varying from 5.07-5.91 x 4.22-5.07 µm rather than 5.07-6.76 (7.6) x 3.38-4.22 (5.07) µm in A. abruptibulbus, thus, taking into consideration the above a new variety Agaricus abruptibulbus var. nullicystidiatus var. nov. is proposed. 
Description type:Original description 
Description:Carpophores 11-12.5 cm in height, placomycetoid. Pileus 5.5-5.7 cm broad, convex dome like; surface moist; white (1A1), cracks, scaly, scales appressed fibrillose, covering the entire pileus, dirty white somewhat light brownish, along the margin appear brown due to soil; margin irregular, not splitting at maturity, involute, white margin extending much beyond gills; cuticle fully peeling; flesh upto 0.3 cm thick, white very slowly browning on cutting and exposure; taste and odour mild. Pileal veil absent. Lamellae free, crowded; unequal, in 3 lengths; moderately broad (0.5 cm broad); brown (7E4); gill edges smooth, white; normal. Stipe central, 10.5-12 cm long, 0.8-0.9 cm broad, upto 1.2 cm broad at base, equal in diameter with abruptly bulbous base, thread like rhizomorphs present; white concolourous with pileus, turning to brown on handling; hollow; smooth; annulate, annulus double, superior, ring like, white, fleshy. Basidiospores 5.07-5.91 x 4.22-5.07 µm (excluding apiculus), (Q=1.2) broadly ellipsoid, double walled, smooth, dark brown, granular, guttulate, one guttule per spore; apical pore absent; apiculate, apiculus upto 0.84 µm long, minute. Basidia 15.21-25.35 x 5.91-9.29 µm, clavate, granular, tetra spored; sterigmata 2.53-4.22 µm long. Pleurocystidia and Cheilocystidia absent; gill edges fertile. Carpophore context homoiomerous. Pileus cuticle hyphal, made up of horizontally tangled, septate hyphae giving rise to a regular turf of projecting hyphae 5.91-9.85 µm broad, closely septate, granular; pileus context made up of intermingled 7.88-19.7 µm broad, septate hyphae and cellular elements, mucilaginous, fully granular. Hymenophoral trama irregular. Stipe cuticle hyphal, made up of longitudinal, tangled, 5.91-11.82 µm broad, septate hyphae. Annular elements cellular, 4.22- 11.83 µm broad, closely septate, granular. Clamp connections absent throughout. 
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