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 Add this item to the list  LAETIPORUS SULPHUREUS (Fr.) Murr
Page number:393 
Description type:Non-original description 
Mycologia 12:11, 1920 - Polyporus sulphureus Fr. Syst. mycol. 1:357, 1821. - Polyporus discolor Kl. Linnaea 8:483,
1833 (K:). - Polyporus miniatus Jungh. Verhand Batav. Genootsch. 17:68, 1838 (L!). - Polyporus rubricus Berk. Hook. J. Bot. 3:81, 1851 (K!).
FRUITBODY annual, pileate, single or more commonly imbricate as large friutbodies, semicircular to fan-shaped, applanate, up to 20 cm in diameter, single pilei up 5 cm thick, fleshy and succulent when fresh, rather light of weight when dry and chalky friable and rather brittle, scent quite pleasant. PILEUS glabrous, azonate, radiate rugose, uneven and slightly undulating, orange to lemon yellow when fresh light ochraceous when dry or dirty brown in old and weathered specimens, margin more vividly coloured in old and dry specimens. PORE SURFACE sulphureous to citric yellow when fresh, discoloured when touched in fresh condition, when dry either pale citric yellow or in weathered specimens more ochraceous to avallaneous, pores round and entire, 3-5 per mm, tubes concolorous with the pore surface, up to 4 mm deep and tubelayer very thin compared with the thick context. CONTEXT up to 3 cm thick at the base, homogeneous, cream to light citric or orange when fresh, crumbly and chalky when dry.
HYPHAL SYSTEM dimitic, generative hyphae simple septate, 3-20 µm wide, thin-walled and mostly collapsed in dry specimens, in the trama of the tubes more or less parallel, 3-6 µm in diameter, partly thin-walled, partly very thick-walled simulating skeletal hyphae: the thin-walled frequently septate and richly branched, the thick-walled arise abruptly from the thin-walled, they are straight and only rarely branched, septa occur occasionally, often very difficult to demonstrate, up to 70-100 µm between each septum. These thick-walled hyphae are, by an untrained observer, easily classified as skeletal hyphae, but according to my opinion they must be regarded as sklerified generative hyphae. However, in form and mode of development they come very close to skeletal hyphae. In the context the generative hyphae are thin-walled, very wide and mostly collapsed, 4-20 µm wide, binding hyphae of a special type dominate the context mostly with numerous small to larger protuberances and strongly brances and sidebranches, from 25 µm wide to 2-3 µm in the outer apices of the sidebranches. SPORES broadly ellipsoid to subglobose, smooth, thin-walled and nonamyloid, 5-7 x 3.5-5 µm.
HABITAT. On deciduous wood of all kinds, frequently on living trees, very rare on conifers. DISTRIBUTION. Cosmopolitan species, In Africa not common, but specimens have been examined from Kenya, Tanzania, Uganda and Rwanda.
REMARKS. The large citric yellow to deep orange fruitbodies make this a conspicuous species. When young and living the consistency is soft and sappy, when dry and dead it becomes harder and brittle with a characteristic cheesy to chalky consistency. It seems to be rapidly destroyed in nature.

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