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Page number:828 
Description type:Non-original description 
Description:Perenniporia subaurantiaca (Rodw. & Clel.) P.K. Buchanan & Ryvarden, Aust. Syst. Bot. 6, 225 (1993). (Fig. 3)
º Poria subaurantiaca Rodw. & Clel., Pap. & Proc. Roy. Soc. Tasmania 1928, 79 (1929) (basionym).
The different collections consist of several fragments of a resupinate basidiocarp, grown on a sloping substrate. Basidiocarp resupinate, adnate, effused, seasonal to perennial, corky, pieces up to 65 x 37 mm, up to 6 mm thick (4-6 mm). Margin narrow, fibrillate, composed of distant radiating hyphae, greyish orange (5B4). Pore surface greyish cream to greyish orange (5B(4-5), Apricot). Pores 4-5/mm, elongated on oblique substrate. Sterile patches scattered over the pore surface light orange (5A(5-6)) to orange (5B(4-5), apricot). Dissepiments entire, smooth. Tube layer vaguely stratified, up to two layers, up to 3 mm thick, concolorous with the pore surface, greyish orange, more light brown near the substrate. Old tube filled with a whitish cottony mycelium. Subiculum reduced to a thin layer close to the substrate, up to 0.5 mm thick, homogeneous, dense, compact, with a corky consistency, concolourous with the tubes.
Hyphal system dimitic. Generative hyphae hyaline, thin-walled, clamped, 2-3.5 µm. Vegetative hyphae hyaline, dextrinoid, cyanophilous. Subiculum homogeneous, made of tightly packed mainly unbranched skeletal hyphae, oriented parallel to the substrate, with a basal clamp, thick-walled but with an open lumen, aseptate, (2.0)-2.5-4.0-(4.5) µm wide, (8 = 3.1 µm). Trama of the tubes mainly made of few branched, straight to slightly sinuous skeletal hyphae, with a basal clamp, aseptate, thick-walled but with an open lumen, ending thin-walled, often with a few lateral aborted processes in the basal part, the latter occasionally geniculated, gradually enlarging from 1.3-2.0 µm diam. at the basal septum up to (1.3)-1.8-2.8-(3.2) µm wide (8 = 2.3 µm). Old tubes filled with narrow, thick-walled, laxly branched hyphae ("stuffing" hyphae), 1-2 µm wide.
Basidia 13-18 x 7-10 µm, with a basal clamp and 2-4 sterigmata (fide Buchanan and Ryvarden 1993). Cystidioles 15-30 x 7-12 µm clavate to mamillate, hyaline, with a basal clamp (fide Buchanan and Ryvarden 1993). Basidiospores (6.7)-7.2-9.5-(11.0) x (3.5)-4.2-5.5-(6.1) µm, R = (1.2)-1.4-2.0-(2.3), (8 = 8.1 x 4.8, 8R = 1.7), ellipsoid to oblong ellipsoid with a rounded apex, thick-walled, without germ-pore, apiculate, hyaline, strongly dextrinoid, cyanophilous. Chlamydospores absent.
Type of rot. White rot.
Cultural features. Unknown. ,
Sexuality. Unknown.
Substrate. Wood.
Known distribution. Tasmania (Australia).
Specimens examined: Australia, Tasmania on wood, L. Rodway no. 8, AD 2577 (Lectotype). Australia, Tasmania, on wood, J.B. Cleland, AD 2459 (Syntype). Australia, Tasmania, J.B. Cleland, Dec. 1918, AD 2458.
Remarks. The resupinate, greyish cream to greyish orange basidiocarp, the dimitic hyphal system with dextrinoid skeletal hyphae and ellipsoid-oblong, not truncate, thick-walled, dextrinoid basidiospores justify the placement in Perenniporia as presently circumscribed, and make the species distinct within the genus. However, basidiospore morphology represents a deviating element within the genus, as typical Perenniporia species have distinctly apically truncate basidiospores. There are however other resupinate Perenniporia species with apically rounded basidiospores such as Perenniporia subacida (Peck) Donk and Perenniporia fergusii Blackwell & Gilbn. For the time being we accept this variation within the Perenniporia group.
Buchanan and Ryvarden (1993) compared P. subaurantiaca with Perenniporia medulla-panis (Jacq. : Fr.) Donk, P. roseo-isabellina (Pat. & Gaillard) Ryvarden and P. gomezii Rajchen. & Wright but they all have apically truncate basidiospores.
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