Hydnoporia rimosa (Lloyd) Spirin & Miettinen

Cho, Minseo, Cho, Yoonhee, Kwon, Sun Lul, Kim, Dohye, Hosaka, Kentaro, Lim, Young Woon & Kim, Jae-Jin, 2024, Taxonomic study of Hydnoporia (Hymenochaetales, Hymenochaetaceae) in East Asia with two new species, MycoKeys 111, pp. 1-20 : 1-20

Hydnoporia rimosa (Lloyd) Spirin & Miettinen , Fungal Systematics and Evolution 4: 92 (2019)

Fig. 5

Diagnosis.

Resupinate, effused basidiome, reddish brown hymenial surface, white to brown margin; cylindrical to narrowly clavate basidia with 10.0–14.1 × 2.7–3.4 μm, sharp to blunt pointed setae with 44.4–83.1 × 8.2–13.4 μm, narrowly cylindrical to allantoid basidiospores with 4.7–6.1 × 1.7–2.0 μm, and occurs on angiosperm branches.

Type.

Japan • Tohoku, Sendai , 24 Oct 1920, Yasuda, (holotype: TNS -F 203210 ; lectotype: MBT 387146 ) .

Description.

Basidiome resupinate, effused, thin, leathery, up to 0.2 mm thick. Hymenial surface smooth, membranaceous, crustaceous, with many cracks, light reddish-brown (2.5 YR, 6 / 4) to reddish-brown (2.5 YR, 5 / 3). Margin sterile, even, edge whitish (7.5 YR, 9 / 2) when fresh and becomes brown (7.5 YR, 5 / 8). Hyphal system dimitic; generative hyphae septate, branched, without a clamp connection, thick-walled, hyaline to pale brown (10 YR, 6 / 3), 3.0–3.5 μm. Skeletal hyphae aseptate, unbranched, without a clamp connection, thick-walled, yellowish (7.5 YR, 6 / 8) to reddish brown (2.5 YR, 4 / 3), 3.5–4.2 μm.

Basidia cylindrical to narrowly clavate, 4 - spored, smooth, thin-walled, hyaline, 10.0–14.1 (– 14.5) × 2.7–3.4 μm. Setae sharp- to blunt-pointed, encrusted with crystals, smooth, bearing a wide or narrow lumen, thick-walled, projecting up to 15 µm above the hymenium, dark reddish brown (2.5 YR, 2.5 / 3), 44.4–83.1 × 8.2–13.4 (– 18.6) μm. Basidiospores narrowly cylindrical to allantoid, smooth, thin-walled, hyaline, with narrow apex, 4.7–6.1 × (1.5 –) 1.7–2.0 μm, L = 5.40 μm, W = 1.80 μm, Q = 2.64–3.30, n = 20.

Specimen examined.

Korea • Gangwon-do, Pyeongchang-gun, Odaesan National Park , 37°44.30'N, 128°35.01'E, alt. 660 m, 9 Nov 2012, Y. Jang & S. Jang, KUC 20121109-19 .

Notes.

The observed Hyd. rimosa specimen from Korea has similar morphological characteristics as those of the type specimen ( TNS - F 203210), but the type specimen has abundant blunt-pointed setae and wider basidiospores (L = 5.22, W = 1.99, Q = 2.47–2.78) ( Miettinen et al. 2019) compared to the Korean specimen. In the phylogenetic tree, Hyd. diffissa is closely related to Hyd. rimosa . These two species are practically indistinguishable in morphology, except that Hyd. rimosa has a wider lumen and greater size variation of setae ( Miettinen et al. 2019). However, they are geographically distinct, where Hyd. diffissa is distributed across North and South America ( Colombia, Peru, and Eastern US) ( Miettinen et al. 2019), while Hyd. rimosa is distributed in East Asia ( Japan, Korea, and Far East Russia) ( Ito 1930 b; Miettinen et al. 2019).

Figures

Figure 5. Morphological characteristics of Hydnoporia rimosa (KUC 20121109-19) A basidiome B microscopic features, s basidiospores; b 1 basidia; b 2 basidioles; h 1 generative hyphae; h 2 skeletal hyphae; se setae. Scale bars: 10 μm (B).