Catathelasma imperiale (P. Karst.) Singer, 1940

Ge, Zai-Wei, Wu, Jian-Yun, Hao, Yan-Jia, Zhang, Qingying, An, Yi-Feng & Ryberg, Martin, 2020, The genus Catathelasma (Catathelasmataceae, Basidiomycota) in China, MycoKeys 62, pp. 123-138 : 123

Catathelasma imperiale (P. Karst.) Singer Fig. 2C, D

Description.

Pileus 8-15 cm broad, hemispherical, convex to plano-convex, later expanded with decurved margin, sometimes depressed to funnel-shaped, smooth, dry to slightly viscid, greyish-brown, reddish-brownish or brown. Lamellae adnate to slightly decurrent, white to off-white when young, whitish to cream when mature, thick, 7-15 mm in height, with 1-2 series of lamellulae; edge smooth, grey to dark brown. Stipe 5-10 × 1.8-3.0 cm, fusiform, attenuate downwards, straight or curved, firm, with double annulus in which the lower annulus is often gelatinous and the upper annulus is membranous, with white to whitish upper surface and grey to brown lower surface. Context firm, white, not changing colour when cut; smell and taste farinaceous. Spore print white.

Basidiospores [60/3/3] 10-14.5 × 4.5-6 μm, hyaline in KOH, amyloid, congophilous, smooth, oblong to subcylindrical in frontal view, subcylindrical to somewhat inequateral in side view, thin-walled, without germ pore. Basidia 35-48 × 7-10 μm, 4-spored, narrowly clavate, hyaline; sterigmata up to 5 μm long. Cheilocystidia basidiole-like, with yellow to brown contents. Pleurocystidia absent. Lamella trama bilateral, composed of more or less parallel to interwoven hyphae. Oleiferous hyphae present in both lamella and pileus trama. Pileipellis a thick ixocutis of loosely interwoven cylindrical, 2-8 μm wide gelatinised hyphae, interspersed with oleiferous hyphae. Clamp connections present, common.

Ecology.

Ectomycorrhizal, solitary or scattered, in forests dominated by Picea spp. or Abies spp.

Specimens examined.

China. Gansu Province: Gannan city, Diebu, Wabagou, alt. 2700 m, 12 August 2012, X. T. Zhu 662 (HKAS 76511), under Picea sp.; Sichuan Province: Gangzi prefecture, Dege, Manigange, alt. 4200 m, 9 August 2013, Z. W. Ge 3477 (HKAS 84315), under Picea asperata Mast.; same locality and date, X. B. Liu 251 (HKAS 79952); Tibet: on the way from Bangda to Changdu, 6 August 2013, Z. W. Ge 3461 (HKAS 84299), alt. 3980 m, under Picea asperata .

Figures

Figure 2. Basidiomes of Catathelasma species in China. A Catathelasma laorentou (HKAS 92245) B Catathelasma subalpinum (HKAS 67751) C Catathelasma imperiale (HKAS 79952) D Young Catathelasma imperiale (HKAS 84299) in association with roots of Picea asperata Mast. Scale bars: 2.5 cm.