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Remarks (public):The species is similar to Perenniporia medulla-panis (Jacq.: Fr.) Donk, but spores are larger (cf. P. medulla-panis: 5-7 x 3-5 µm) and the hyphal system is considered to be dimitic. Another resupinate species with similar pores is P. compacta (Overh.) Gilb. & Ryv. which, however, has chlamydospores and wider basidiospores. P. roseoisabellina (Pat. & Gaill.) Ryv. from South America is similar in macromorphology, but again has wider basidiospores (7-9 x 5-7 p.m). P. gomezii Rajch. & Wright, also from South America, has similar spores (7-9.4 x 3-4.2 µm) but pores have a distinctly chocolate colour. The striking character of P. subaurantiaca is the oblong-ellipsoid, almost drop-like spores, which make the species easy to recognise.
Cunningham (1965) judged P. subaurantiaca to be a synonym of Trametes muelleri Berk., based apparently on his examination of AD 2460, although Cunningham annotated the packet of AD 2460 (= PDD 7104) `resupinate specimen of Coriolus occidentalis'. We are not confident of the identity of AD 2460, owing to lack of spores.
Two syntype collections are designated in the protologue: `Tas. - L.R., no. 8' and `N.S.W. - National Park, March 1919'. The Tasmanian material (AD 2577!, 2459!) comprises fertile specimens of a species of Perenniporia Murr., while the N.S.W. material (AD 2460!) is a sterile specimen of a species of Trametes Fr. sensu lato. Characters of both species are included in the original description of Poria subaurantiaca.
AD 2577 is designated the lectotype because it is fertile and is the only Tasmanian collection to bear the number `8'. An annotation by Lloyd on the packet of AD 2577 indicates that he had been unable to identify the specimen for Cleland.
Description type:- 
Description:Poria subaurantiaca Rodway & Cleland [as subaurantiacus]
Perenniporia subaurantiaca (Rodw. & Clel.) P.K. Buchanan & Ryv., comb. nov. (Fig. 5)
Basionym: Poria subaurantiaca Rodway & Cleland, Pap. & Proc. Roy. Soc. Tasmania 1928: 79 (1929).
Lectotype: on wood, Australia, Tasmania, L. Rodway no. 8 (AD 2577!).
Basidiocarps resupinate, perennial, to 4 mm thick, growing on an oblique surface. Pores 5-6 per mm, pale brown; sterile margin orange-brown. Hyphal system dimitic; generative hyphae hyaline, 1.7-2.5 µm diam., thin-walled, with clamp connections. Skeletal hyphae dextrinoid, sparingly branched, in context pale yellow-brown, 3-5.5 m diam. with walls to 2 µm thick, in trama narrower, 2.5-4 µm diam., subhyaline to hyaline. Cystidioles mamillate, hyaline, 15-30 x 7-12 µm. Basidia 2-4-sterigmate, 13-18 x 7-10 µm. Spores hyaline, ellipsoid-oblong, strongly dextrinoid, 7.5-10 x 4-6 Jim, walls thickened to 0.8 µm wide.
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