Name: Panellus pusillus
Author: (Pers. ex Lév.) Burds. & O.K. Mill.
Citation: Beih. Nova Hedwigia 51: 85 (1975) / Burdsall, H.H.; Miller, O.K. 1975. A reevaluation of Panellus and Dictyopanus (Agaricales). Beihefte zur Nova Hedwigia. 51:79-91
Pileus 5-20(-27) (-32, Singer, 1945, p. 225) mm broad (Pl. 15, Fig. 3), reniform to semicircular, convex to planate, nearly white to pale tan when fresh, reddish brown after several years in herbarium, reviving when moistened, surface dry, pubescent to appressed woolly, azonate, margin concolorous, nearly smooth. Pores concolorous with cap both when fresh and dry, pore surface irregular with some pores slightly longer than others, 4-5/mm across basidiocarp, elongated radially (2-3/mm in that direction), sometimes becoming sublamellate (Pl. 15, Fig. 2), luminescent when fresh. Flesh of cap white, white to pale cream on drying. Spore print white.
Basidiospores (Pl. 16, Fig. 11) 4-5.5 × 2-3 µm, ovoid to broadly ovoid, adaxially flattened, hyaline, thin-walled, smooth, amyloid (blue) in Melzer’s reagent. Basidia (Pl. 16, Fig. 11) 12-20 × 4-5 µm, clavate, clamped at base, 4-sterigmate. Pleurocystidia (Pl. 16, Fig. 11) lacking or present only near the pore edge, 20-35 × 3-4 µm, cylindrical to lanceolate, hyaline, thin-walled, smooth, clamped at base, protruding up to 1/2 of total length. Cheilocystidia inconspicuous, cylindrical, 4-6 a diam, thin-walled, hyaline with refractive contents, imbedded in dense cluster of acanthophysoid end cells and some reddish-brown encrusting granules making up the pore apex (Pl. 15, Fig. 6). Cuticle (Pl. 15, Fig. 4) a loose textura intricata, hyphae 2-4 a diam, thin-walled to slightly thick-walled, clamped, much branched, with acanthophysoid end cells. Pileo-cystidia imbedded in cuticle (Pl. 15, Fig. 4), inconspicuous, 5-6.5 µm diam, cylindrical, flexuous, thin-walled, hyaline, with refractive content. Pileus trama (Pl. 16, Fig. 11) a compact textura intricata, hyphae 3-7(-10) a diam, with irregularly thickened walls (walls up to 5.5 a thick) frequently appearing eroded on surface, unencrusted, clamped. Pore trama like the pileus trama but with slightly thinner walls. Stipe cuticle like that of pileus cuticle (Pl. 15, Fig. 5) with caulocystidia like the pileocystidia.