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 Add this item to the list  MICROPORUS XANTHOPUS (Fr.) Kunt.
Page number:440 
Description type:Non-original description 
Description:MICROPORUS XANTHOPUS (Fr.) Kunt.
Rév. gen. Pl. 3:494, 1898. -Polyporus xanthopus Fr. Syst. mycol. 1:350, 1821. - Polyporus perula Fr. Epicr. p. 437, 1838. - Polyporus saccatus Pers. p 169 in Gaud. Voyage aut. Monde. 1826. - Polyporus siennacolor Berk. - Polyporus cupreo-nitens Kalch. in Thuem, Myc. Univ. exsicc. no 1702, 1881.
Special literature: Corner, E. in Ann. Bot. 46:71-111, 1932.
FRUITBODY annual, solitary or in small groups, centrally or laterally stipitate and usually infundibuliform, sometimes two or more fruitbodies may grow together to more complicated fruitbodies with several stipes and with imbricate pilei, margin wavy and lobed, often deeply incised, pileus may be irregularly developed and the fruitbody may appear almost flabelliform, but normally there is a poroid area surrounding the stipe even in the most irregular fruitbodies, in the peripheral parts often radially furrowed, consistency tough to coriaceous. PILEUS up to 10 cm in diameter and 1-3 mm thick, glabrous and shiny when fresh, more dull when dry, yellowish-brown to chestnut in numerous narrow concentric zones, often with alternating dark and light colours, margin thin and wavy. STIPE round, glabrous, covered with a thin, light yellowish to light brown cuticle, up to 6 cm high and 3-9 mm in diameter, slightly expanded upwards, and expanded to a disclike base up to 10 mm in diameter. The base is covered with a very finly adpressed tomentum which slowly wears awy with age, context of stipe pure white, dense in the periphery, somewhat looser in the core. PORE SURFACE cream to pale buff, almost pure white towards the margin, pores entire and very minute, almost invisible to the naked eye 8-10 per mm, tubes up to 0.1 mm deep. CONTEXT pure white, very thin and covered with a distinct cuticle.
HYPHAL SYSTEM trimitic, generative hyphae thin-walled and with clamps, 2,3,5 µm in diameter, moderately branched, skeletal hyphae dominating, hyaline and thick-walled, up to 6 µm in diameter, binding hyphae tortuous and mostly broken in preparations, thick-walled to apparently solid, up to 1-3 µm in diameter, strongly coralloid dichophytic elements often present along the dissepiments, very finely branched and often partly covered with cyrstalline deposits so their true nature may easily be unnoticed by an untrained observer, in preparations they easily break off at the main stem and we have been unable to verify whether they arise from generative hyphae or represent the outer apices of the binding hyphae. SPORES hyaline, cylindrical, often slightly bent, smooth and non-amyloid, 6-7.5 x 2-2.5 µm, usually very difficult to find in old and dry specimens and the basidia collapse very rapidly into a honeycomb patteren, apparently very shortlived.
HABITAT. On dry deciduous wood, often in open habitats like savanna, riverbeds and on trunks left after lumbering. DISTRIBUTION. Very common throughout the tropics in the Old World, from Western Africa to the Pacific Area.
REMARKS. Usually easy to recognize in the field because of the infundibuliform fruitbodies with a glossy and shiny strongly banded pileus, the yellowish glabrous stem and the very minute pores. Even if one side of the pileus may be depressed, it is usually not difficult to separate the species from M. affinis with truely flabelliform fruitbodies.
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