Hymenochaete dracaenicola Z.B. Liu & Y.C. Dai, 2021

Du, Ping, Cao, Tian-Xu, Wu, Ying-Da, Zhou, Meng & Liu, Zhan-Bo, 2021, Two new species of Hymenochaetaceae on Dracaena cambodiana from tropical China, MycoKeys 80, pp. 1-17 : 1

Hymenochaete dracaenicola Z.B. Liu & Y.C. Dai sp. nov. Figs 5 , 6

Diagnosis.

Hymenochaete dracaenicola is characterised by annual, resupinate basidioma with a clay buff hymenophore, a dimitic hyphal system, absence of tomentum and cortex, subulate setae present in hyphal layer, absence of cystidia, presence of cystidioles and simple hyphidia, and oblong ellipsoid basidiospores measuring 5.2-5.8 × 2.5-2.8 µm.

Holotype.

China. Hainan Province, Sanya, Daxiaodongtian Park, N18.299, E109.172, on dead tree of Dracaena cambodiana , 15.XI.2020, Dai 22090 (BJFC 035983).

Etymology.

Dracaenicola (Lat.): referring to the species s growing on Dracaena cambodiana .

Fruiting body.

Basidioma annual, resupinate, adnate, not separable from substrate, hard corky, up to 7.5 cm long, 2 cm wide, and less than 0.1 mm thick at center. Hymenophore surface smooth or locally verruculose, clay buff, with some scattered crevices; margin cinnamon buff, up to 0.4 mm.

Hyphal structure.

Hyphal system dimitic; generative hyphae infrequent, simple septate; skeletal hyphae dominant; tissues darkening but otherwise unchanged in KOH.

Subiculum.

Tomentum and cortex absent; hyphal layer present. Generative hyphae infrequent, hyaline, thick-walled, simple septate, often branched, 1-2 µm in diam. Skeletal hyphae cinnamon to orange brown, thick-walled to subsolid, rarely branched, interwoven, 1.5-2.5 µm in diam.

Hymenium.

Hyphae similar to those in hyphal layer. Setal layer present, thickening with age, with one to several rows of overlapping setae. Setae numerous, subulate with blunt to acute tips, orange brown to reddish brown, smooth, occasionally with a hyphal sheath, distinctly thick-walled, 30-57 × 6-10 µm, embedded or projecting up to 35 µm beyond the hymenium. Cystidia absent; cystidioles present, fusoid, hyaline, thin-walled, basally swollen, with a sharp or often hyphoid neck, 10-17 × 2.5-4 μm; Simple hyphidia present, scattered, thick-walled, 15-36 × 2-3.5 µm. Basidia subclavate to subcylindrical, with walls thickening toward the base, with four sterigmata and a basal simple septum, 17-23(-25) × 3.5-5 µm; basidioles similar to basidia but smaller.

Spores.

Basidiospores oblong ellipsoid with an apiculus, hyaline, thin-walled, smooth, IKI-, CB-, occasionally bearing a guttule, (5-)5.2-5.8(-6.1) × 2.5-2.8 µm, L = 5.6 µm, W = 2.68 µm, Q = 2.03-2.15 (n = 60/2).

Additional specimen (paratype) examined.

China. China. Hainan Province, Sanya, Daxiaodongtian Park, N18.299, E109.172, on fallen branch of Dracaena cambodiana , 15.XI.2020, Dai 22096 (BJFC 035988).

Figures

Figure 5. A basidiocarp of Hymenochaete dracaenicola (Holotype, Dai 22090). Scale bar: 1.0 cm. Photo by: Zhan-Bo Liu.

Figure 6. Microscopic structures of Hymenochaete dracaenicola (Holotype, Dai 22090) a basidiospores b basidia and basidioles c cystidioles d hyphidia e setae f Hyphae from hyphal layer. Drawings by: Meng Zhou.