Cantharocybe virosa (Manim. & K.B. Vrinda) T.K.A. Kumar

Hosen, Md. Iqbal, Li, Tai-Hui, Lodge, Deborah Jean & Rockefeller, Alan, 2016, The first ITS phylogeny of the genus Cantharocybe (Agaricales, Hygrophoraceae) with a new record of C. virosa from Bangladesh, MycoKeys 14, pp. 37-50 : 41-43

Taxon classification Fungi Agaricales Hygrophoraceae

Cantharocybe virosa (Manim. & K.B. Vrinda) T.K.A. Kumar Figs 2, 3

Cantharocybe virosa (Manim. & K.B. Vrinda) T.K.A. Kumar, Mycotaxon 124: 235 (2013).

≡ Megacollybia virosa Manim. & K.B. Vrinda, Mycotaxon 111: 364 (2010).

Description.

Basidiomata medium-sized to large. Pileus 50-80 mm diam., convex at first then applanate, sometimes uplifted with cracked margin, tawny gray, dark brown (6E4-5) to grayish brown (5E3-5E4, 6E3-6F4), dry, pruinose or with fine appressed scales under lens, margin without striation. Hymenophore lamellate; lamellae adnate to decurrent, subdistant to crowded, white to pallid white (5A1, 6A1); lamellulae numerous, concolorous with lamellae. Stipe 50-80 × 10-15 mm, central, slightly curved, cylindrical, gradually thickening towards the base, at the apex ribbed by the subdeccurent lines of the hymenophore, upper half pale gray or brownish gray (5D2) to grayish brown (5E3) pruina or squamules and the remaining half nearly concolorous with the pileus, with cottony mycelium at the base, interior solid, milky white to white. Context 12 mm thick in the center of the pileus, milky white to white (6A1), firm, solid, unchanging when cut or bruised.

Basidiospores [40/2/2] (8-) 8.5 –10(– 11.5) × 5 –6.2(– 7.0) µm, [Q = 1.54-1.62, Qm = 1.58 ± 0.12] ellipsoid to broadly ellipsoid, hyaline, thin-walled, smooth, inamyloid, apiculus conspicuous. Basidia 45-60 × 8-11 µm, clavate, hyaline, thin-walled, 4-spored, sterigmata up to 8 µm long; basal septum usually clamped. Cheilocystidia 25-45 × 5-9 µm, abundant, lecythiform to lageniform, sometimes with a mucronate apex, basal portion usually clavate, the upper portion extending into an elongated neck up to 15 µm long with or without a rounded capitulum; basal septa often clamped. Pleurocystidia absent. Lamellar trama parallel to sub-regular composed of branching filamentous hyphae 4-10 µm wide, hyaline to pale yellow, thin-walled. Pileipellis a trichoderm, slightly interwoven, composed of 6-10 µm wide hyphae with often pale brown vacuolar to plasmatic pigments; terminal cells 20-65 × 6-10 µm, usually cylindrical to somewhat narrowly clavate, sometimes mucronate; pileocystidia with or without extending neck, occasionally with one or two short rounded capitula, elongated neck up to 15 µm long, clamp connection frequently present at septa. Stipitipellis composed of vertically arranged, branching, 7-10 µm wide filamentous hyphae, outer surface more or less covered with cylindrical to narrowly clavate cells (35-100 × 6-11 µm) with or without a rounded capitulum, mostly similar to cheilocystidia but sometimes double necked with an extending capitulum head, pale brown vacuolar to plasmatic pigments. Clamp connections common at septa.

Habitat.

Solitary or in clusters, associated with roots of Cocos nucifera (collection Iqbal 568) or along the roadside on ground (collection Iqbal 693) near Cocos nucifera .

Distribution.

Known from tropical South Asia, Bangladesh and India.

Specimens examined.

Bangladesh, Dhaka division: Tangail, Madhupur, Bangladesh Agricultural Development Corporation (BADC) campus, 24°37'35"N, 90°03'33"E, 05 Aug 2012, 20-25 m, Iqbal 568 ( HKAS 79012, PHI-12); same location, 18 Jun 2013, Iqbal 693 (PHI-13). Belize, Orange walk district: La Milpa Field State, La Milpa Archaeological Site, 17°50'30"N, 89°1'0"W, 100 m ( CFMR), 25 Oct 2002, DJL-BZ-85 (BZ-1883).