Dacryobolus montanus X.Z. Wan & H.S. Yuan, 2016

Yuan, Hai-Sheng, Kan, Yu-He & Wan, Xian-Zhen, 2016, Two new brown-rot corticioid fungi in Dacryobolus (Basidiomycota) from southwestern China, Phytotaxa 265 (2), pp. 101-111 : 107-108

Dacryobolus montanus X.Z. Wan & H.S. Yuan , sp. nov. Figs. 5 , 6 .

MycoBank no.: MB802967

Differs from Dacryobolus sudans in having shorter basidia, absence of aculeal cystidia or cystidioles, narrower basidiospores and without viscid liquid on the tip of the aculei; differs from D. gracilis in angiosperm substrates and absence of cystidia.

Holotype: CHINA. Guangxi Auto. Reg., Xing’an County, Maoershan Nature Reserve , on angiosperm stump, alt. 1700 m, 21.VIII.2011, Yuan 5673 (holotype in IFP).

Gene sequences ex holotype: KC344410 (ITS), KC344411 (LSU).

Etymology: Montanus (Lat.) = growing on mountains, referring to grow on high altitude mountains.

Fruitbody: — Basidiocarps annual, resupinate, effused, closely adnate, fragile and ceraceous, without odour or taste when fresh, rigid upon drying, up to 12 cm long and 3.5 cm wide. Hymenophore odontioid, aculei conical to cylindrical, solitary, buff-yellow to buff when young, buff-yellow to yellow-ochraceous with age, 2 per mm at the margin and 2–3 per mm in center, aculeal bases 0.4–0.5 mm wide when old, usually joined in pairs or in small groups of aculei, but solitary at acuminate apices, un-forked, up to 1.5 mm long; margin thinning out, indeterminate, pale yellow to cream, minutely fimbriate. Subiculum thin, leathery, cream to pale buff, less then 1 mm.

Hyphal structure:—Hyphal system monomitic; generative hyphae bearing clamp connections, secondary simple septa present; all hyphae IKI-, CB-; tissues unchange color in KOH.

Subiculum:—Subicular hyphae of two kinds: main hyphae colorless, thick-walled to subsolid, moderately branched, straight, 4–8 μm diam, moderately with short tube-like side-branches perpendicular to the main hyphae; tortuous hyphae origin from side-branches of main hyphae, colorless, thick-walled to subsolid, with clamp connections, frequently branched, sinuous as binding hyphae, 2.5–4 μm diam, interwoven.

Aculei:—Tramal hyphae colorless, thin-walled, slightly thick-walled to thick-walled, bearing clamp connections, secondary simple septa present, occassionally branched, 3–5.5 μm diam, subparallel. Cystidia and cystidioles absent; basidia narrowly clavate, with a basal clamp connection and four sterigmata, 15–23 × 2.8–3.3 μm; basidioles in shape similar to basidia, but slightly smaller.

Spores:—Basidiospores allantoid, colorless, thin-walled, smooth, IKI-, CB-, (4.8–)5–5.6(–5.8) × 1–1.3(–1.5) μm; L = 5.2 μm, W = 1.18 μm, Q = 4.25–4.4 (n = 60/2).

Type of rot: — Brown rot.

Additional specimen (paratype) examined: CHINA. Guangxi Auto. Reg., Xing’an County, Maoershan Nature Reserve, on angiosperm stump, alt. 1700 m, 21.VIII.2011, Yuan 5758 (IFP).

Other specimens examined: Dacryobolus sudans . Finland.Inari,Ivalo,Kaunispaa,on decorticated Pinus log, 24.IX.2009, Kotiranta 23264 (H); University of Helsinki, Toukola,Arabian ranta, on Pinus , 11.VIII.1998, Reima Saarenoksa 13098 (H); USA. Montana State, Lincoln County, Island Lake, Kootenai National Forest, on Pinus contorta , 13.VII.1971, HHB-5699 (CFMR); New York, Newcomb, Huntington Forest, on Picea , 29.X.1949, Czabator 2410 (FH).

Figures

FIGURE 5. Basidiocarps of Dacryobolus montanus (holotype).

FIGURE 6. Microscopic structures of Dacryobolus montanus. A: Basidiospores. B: Basidia and basidioles. C: Hyphae from a section of aculei. D: Hyphae from subiculum.