Haddowia longipes

Haddowia longipes (Lév.) Steyaert

Facesoffungi number: FoF05666

Basidiome annual to perennial, stipitate, mesopodal, corky, becoming woody when dry. Pileus 3–8 cm, up to 0.3 cm thick at the base, reniform; upper surface light yellow (3A5) to yellowish-white (3A2) when young, becoming brown (6E4) when old, strongly laccate, slightly concentrically sulcate, slightly depressed in the mid; margin soft, obtuse, 1 mm thick, white (4A1); lower surface white (4A1). Hymenophore up to 5 mm long, indistinctly stratose, pores circular, subcircular or isodiametric, 2–3 pores per mm. Context up to 3 mm thick, dry, duplex, not completely homogeneous in color, upper layer light brown (5D6), fibrous, composed of coarse loose fibrils, brown (6E8), corky; lower layer pale brown (5A5), woody. Stipe stout cylindric, concolorous with the pileus, lateral to horizontally lateral or eccentric, 12 × 7 cm. Basidiospores (n = 25) (10.8)11.6–12.7–13.8(14.6) × (9.3)10.3–10.9–11.6(12.0) μm (Qm = 1.2, Q = 0.9–1.3, with myxosporium) (8.8)10.0–10.9–11.8(12.8) × (7.7)8.7–9.5–10.3(10.5) μm (Qm = 1.2, Q = 1.0–1.4, without myxosporium), subglobose to broadly ellipsoid, brown (6E8) to dark brown (6F8), with a yellowish orange (4B7) eusporium bearing thick echinulae, overlaid by a hyaline myxosporium, with longitudinal double crests partly connected with short transverse walls. Pileipellis a hymeniderm, pale yellow (4A3) streaks the cutis, a closely-packed palisade, yellowish-white (4A2), club-shaped terminal elements. Context trimitic; generative hyphae (n = 25) (1.1–1.3–1.6) μm in width, colorless, thin-walled; skeletal hyphae (n = 25) (2.4–3.1–4.1), thick-walled, sometimes branched, grey (4B1), dextrinoid; binding hyphae (n = 25) (2.6–3.5–4.4) μm in width, grey (4B1), branched. (Fig. 1)

Habitat: Rotten wood, dry root area, in dry dipterocarp forest and in upper mixed deciduous forest and growing up from soil.  

Specimens examined: LAOS, Xiengkhouang Province, Phoukoud District, Yai village, Evergreen forest, 19o58′N–103o00′Eo, elev. 1120 m, 27 July 2017, P. Phengsintham (GACP17072708, GACP17072710).

Notes: Haddowia longipes was introduced as Polyporus longipes (Steyaert 1972). Torrend (1920b) transferred this species into Amauroderma based on morphology: spherical stalk, distinct thorns and longitudinally parallel strips with crested basidiospores with the size of (12.0–14.0) μm. Microscopically the species should be easy to recognize because of the crested spores and the basidiome reminds of a Ganoderma species (Ryvarden & Johansen (1980).Steyaert (1972) combined this species into the genus Haddowia describing the ellipsoid basidiospores: (12.0–15.3– 19.0 × 10.0–12.0–14.5) μm. Ryvarden & Johansen (1980) mentioned the basidiospore size as (12.0–17.0–19.0 × 10.0–14.0–15.0) μm. Furtado (1981) observed oval shape basidiospores with the size of (12.0–14.0 × 10.0–12.0) μm. In our study, we observed crested basidiospores with the size of (12.0–14.0 × 10.0–12.0) μm. Combined molecular data of ITS, nrLSU and nrSSU clearly make Haddowia as an independent clade from Ganoderma and Amauroderma. This species is reported from Africa and Neotropical countries (Steyaert 1972, Ryvarden & Johansen 1980, Corner 1983), Australia's overseas territory, Christmas Island, Angola, French Guiana, Costa Rica, Kenya (Furtado 1981), China (Teng 1963, Tai 1979, Zhao 1989, Zhao & Zhang 2000, Zhang et al. 2015), India, Philippines (Ryvarden & Johansen 1980) and Laos (This study).concept of Humphreya may represent a genus independent of Ganoderma (Costa-Rezende et al. 2017). However, Humphreya’s position at genus level is still uncertain given the lack of sufficient DNA sequence data analyses (Costa-Rezende et al. 2017). Currently there are four species, i.e. H. coffeata, H. eminii, H. endertii and H. lloydii described under this genus according to Index Fungorum (www.indexfungorum.org, accessed 22 March 2019). (Notes from Hapuarachchi et al. 2019)