Ramaricium yunnanense C.L. Zhao, 2022

Gu, Jin-Ying & Zhao, Chang-Lin, 2022, Ramaricium yunnanense sp. nov. (Gomphaceae, Gomphales) from China, Phytotaxa 573 (1), pp. 123-130 : 126

Ramaricium yunnanense C.L. Zhao , sp. nov. Figs. 2 , 3

MycoBank no.: MB 841259

Holotype:— CHINA. Yunnan Province, Puer, Jingdong County, Wuliangshan National Nature Reserve , E 100°32′, N 24°36′, alt. 1600 m, on the angiosperm trunk, 5 October 2017, CLZhao 4179 ( SWFC!), GenBank No. (ITS ON054914 ; nLSU MZ 881949 ).

Etymology:— yunnanense (Lat.) : the epithet refers to the Province in China “ Yunnan ” where the type species was collected.

Description:— Basidiomata annual, resupinate, cottony, without odor or taste when fresh, becoming flocculent on drying, up to 7 cm × 4 cm (length × breadth), up to 300 µm thick. Hymenial surface smooth, white when fresh and drying. Margin sterile, fimbriate, white, up to 1.5 mm wide.

Hyphal system monomitic, generative hyphae colorless, thin - walled, bearing clamp connections, IKI–, CB–; tissues unchanged in KOH.

Subiculum generative hyphae colorless, more or less interwoven, thin - walled, rarely branched, presence of encrusted hyphae, 2.5–5 µm in diameter.

Hymenium cystidia and cystidioles absent; basidia pleural, clavate, with four sterigmata, and a basal clamp, slightly constricted in the middle to somewhat sinuous, 14–23 × 6–8µm; basidioles dominant, in shape similar to basidia, but slightly smaller.

Basidiospores ellipsoid to subglobose, colorless, thin - walled, ornamented, IKI–, cyanophilous, (3.8)4 – 5(– 5.4) × 3 – 4.5(4.7) µm, L = 4.53 µm, W = 3.70 µm, Q = 1.22 (n = 30 / 1).

Additional specimen (paratype) examined:— CHINA. Yunnan Province, Puer, Jingdong County, Wuliangshan National Nature Reserve , E 100°32′, N 24°36′, alt. 1600 m, on the angiosperm trunk, 5 October 2017, CLZhao 4158 ( SWFC!) , GenBank No. (ITS MZ 746097 ; nLSU MZ 881948 ) .

Figures

FIGURE 2. Basidiomata of Ramaricium yunnanense. A. Habit; B. A close up view. Bars: A = 1 cm, B = 1 mm (holotype). Photos by: Jin-Ying Gu

FIGURE 3. Microscopic structures of Ramaricium yunnanense (drawn from the holotype).A. Basidiospores; B. Basidia and basidioles; C. Encrusted generative hyphae; D. A section of hymenium. Bars: A = 5 µm; B–D = 10 µm. Drawings by: Jin-Ying Gu