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 Add this item to the list  PHELLINUS ROBUSTUS (Karst.)
Page number:209 
Description type:Non-original description 
Description:PHELLINUS ROBUSTUS (Karst.)
Bourd. & Galz. Hym. France p. 616, 1928. - Fomes robustus Karst. Krit. Overs. Finl. Basidsv. p. 467, 1889, for synonyms see Lowe (1957).
FRUITBODY perennial, pileate, adnate, first cushion like with a steep pileus, then more hoof-shaped and triquetrous in section and with age more applanate and semicircular, more rarely dimidiate with a contracted base, tough and hard when fresh, very hard when dry. PILEUS first even or with fine warts and low ridges, with age undulating and becoming zoned in broad sulcate rounded bands, 0.5-2 cm wide, first finely tomentose, cinnamon to light rusty brown, becoming glabrous and dull, with age first greyish then brownish black, often deeply cracked when dry, margin rounded, in old specimens all these stages can be observed from the rounded, light brown margin to the deeply cracked blackish base. PORE SURFACE fulvous to deep brown, margin very wide, finely tomentose to glabrous and light rusty brown to cinnamon, pores small, 5-6 per mm, tubes distinctly stratified, up to 3 mm deep in each layer, totally very deep and up to 12 cm measured in some large specimens, yellowish to light rusty brown. CONTEXT yellowish to cinnamon, shiny when broken and mostly distinctly stratified, up to 6 cm thick at the base. HYPHAL SYSTEM dimitic, generative hyphae thinwalled, hyaline, 2-3 µm wide, simple septate, skeletal hyphae quite wide, 4-8 µm wide, walls about 1 µm thick, yellowish-brown to deep rusty brown in the context. SETAE usually absent, very rarely seen, subulate, thick-walled and yellowish brown, 12-20 x 4-6 µm, pseudosetae quite common, partly ventricose with elongated tip, partly rounded, slightly thick-walled and yellowish. CYSTIDOLS very common in the hymenium and of very variable shape, partly hyphal, partly ventricose with an elongated tube, in old tubes this upper part can be up to 100 µm long, partly bottle-shaped with a small top, hyaline to slightly thick-walled in the lower part, mostly simple, rarely with a single branch appearing on top of the ventricose part, there are all transitions over to the pseudosetae described above. SPORES globose, to weakly drop-shaped, thick-walled, smooth, light yellowish, strongly dextrinoid, 6-8.5 x 5.5-7.5 µm.
HABITAT. On dead living deciduous trees. DISTRIBUTION. Almost cosmopolitan, from the tropics and reaching far into the temperate zone, in East Africa it seems to be rare and specimens have only been seen from Ethiopia and Tanzania.
REMARKS. Phellinus robustus is a very variables species and has been described many times as new, especially in the tropics. Characteristic is the cushion-shaped to ungulate fruitbody, shiny yellow-brown context, usual absence of setae and hyaline to pale yellow globose spores, strongly dextrinoid.
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