Dendrodontia hyphopaxillosa M.J. Li & H.S. Yuan, 2014

Dendrodontia hyphopaxillosa M.J. Li & H.S. Yuan View in CoL sp. nov. ( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 & 3 View FIGURE 3 )

MycoBank MB 804970

Carpophorum resupinatum, adnatum, effusum, membranaceum, 40–100 µm crassum. Facies hymenii ravida, odontoidea. Systema hypharum dimitica, hyphae generatoriae fibulatae, hyphae sceletales 2–3 µm diam. Basidiosporae hyalinae, ellipsoideae vel subcylindricae, IKI–, CB–, (5.4–)5.5–6.7(–7) × (2.1–)2.2–3(–3.2) µm.

Holotype:— CHINA. Guangxi Autonomous Region, Shangsi County, Shiwandashan Forest Park , on fallen angiosperm branch, 24 July 2012 Yuan 6269 ( IFP).

Etymology: — hyphopaxillosa : referring to having many hyphal pegs on basidiocarps.

Fruitbody: —Basidiocarps annual, resupinate, adnate, effused, membranaceous, 40–100 µm thick in section (hyphal pegs excluded), cracking on drying. Hymenial surface grayish, odontioid due to hyphal pegs, margin thinning, concolorous, often abrupt. Hyphal pegs grayish, separate or congregate, subulate to cylindrical, 30–50 µm wide at base, up to 90 µm high, densely distributed, 100–130 per mm 2. Subiculum grayish, up to 100 µm thick.

Hyphal structure: —Hyphal system dimitic; generative hyphae with clamp connections; skeletal hyphae brownish, IKI–, CB+; tissues unchanged in KOH.

Subiculum: —Generative hyphae hyaline, thin- to slightly thick-walled, rarely branched, regularly arranged to interwoven, 1.2–3 µm in diam; skeletal hyphae yellowish brown, thick-walled to subsolid, 2–3 µm in diam.

Hyphal pegs and hymenium:—Hyphal pegs arising from subiculum, with rounded apex, heavily covered by crystalline chips, consisting of upright fascicles of hyphae arising from subiculum, without a ceraceous core; generative hyphae scanty, hyaline, thin-walled, 1.8–3 µm in diam; skeletal hyphae brownish, thick-walled to subsolid, rarely branched, 2–3 µm in diam, subparallel arranged along hyphal pegs. Hymenium restricted to the resupinate part between hyphal pegs. Cystidia absent. Dendrohyphidia present, hyaline, thin-walled, tortuous and frequently branched. Basidia subclavate, clamped at base, bearing four sterigmata, 12–16 × 4–6 µm, sterigmata 2– 6 µm long. Basidioles in shape similar to basidia, but slightly smaller.

Basidiospores: —Ellipsoid to subcylindrical, hyaline, thin-walled, smooth, IKI–, CB–, (5.4–)5.5–6.7(–7) × (2.1–)2.2–3(–3.2) µm. L = 6.07, W = 2.69, Q = 2.24–2.27 (n=60/2).

Additional specimens examined (paratype): — CHINA. Guangxi Autonomous Region, Shangsi County, Shiwandashan Forest Park , on fallen angiosperm branch, 26 July 2012 Yuan 6326 ( IFP) .