Search on : Taxa descriptions


 Add this item to the list   AMYLOSPORUS CAMPBELLII (Berk.) Ryv.
Page number:243 
Description type:Non-original description 
Norw.J.Bot. 24:217, 1977 - Polyporus campbellii Berk. Hook. J. Bot. 6:228, 1854.(K!). - Tyromyces graminicola Murr. Tropical polypores p. 21, 1915 (K:). - Polyporus propinquus Lloyd Mycol. Writ. 7:1109, 1922 (teste Gilbertson & Lowe 1970:702, see below). - Scutiger tisdalei Murr. Lloydia 6:227, 1943 (teste Lowe in litt). -Polyporus friabilis Bose J. Indian Bot. 2:300, 1921.
Special literature: Gilbertson, R.L. & Lowe, J. L. 1970: Tyromyces graminicola in North America. Mycologia 62:699706.
FRUITBODY annual, pileate, up to 15 cm wide in single specimens, centrally to laterally stipitate to almost sessile and then dimidiate with a more or less fan shaped fruitbody, pileus circular to irregular, frequently lobed and incised and undulating, single or in clusters, soft when fresh, drying light and brittle. PILEUS finely velutinate and soft to touch, whitish when fresh, drying buff to ochraceous, in older parts with darker spots and here often with a very thin pellicle, surface uneven, slightly undulating with furrows and rounded low protuberances and elongated ridges, margin sharp and partly reflexed. STIPE short to almost absent, usually tapering to a root-like base, up to 6 cm high, indistinctly intergrading with the pileus, ochraceous to dirty brown, often spotwise, finely velutinate to smooth as the outer hyphae agglutinate with age. PORE SURFACE ochraceous to buff, pores round to angular on horizontal parts of the pileus, 2-4 per mm, lacerate to sinuous on sloping parts and on the upper part of the stipe, up to 1 mm long, tubes concolorous with pore surface, ochraceous when fresh, pale resinous brown when dry and then brittle, up to 10 mm deep. CONTEXT white to ochraceous, homogenous, soft when fresh, slightly compressible when dry, but rather dense, up to 2 cm thick towards the stipe.
HYPHAL SYSTEM dimitic, generative hyphae mostly with simple septa, in the trama thin-walled and mostly 3-8 µm wide, in the context frequently up to 12 µm in a few cases up to 15 µm wide, simple septate or with single or double clamps. Skeletal hyphae common, thick-walled, pale golden yellow, unbranched or with a few branches in the context and here up to 8 µm wide, in the trama more contorted and narrower, 3-5 µm wide mostly. GLOEOPLEUROUS HYPHAE mostly confined to the context, almost hyaline to yellowish with an oily to granular content, 6-14 µm wide, thin-walled or with distinctly thickened walls, long segments without septation, the content is negative with sulfobenzaldehyde and Melzer, but stains in cotton blue, simple septate or with large clamps which however can be difficult to find, these hyphae must be interpreted as specialized generative hyphae. BASIDIA. clavate with 4 sterigmata, 4-6 µm long. CYSTIDIA none. SPORES broadly ellipsoid to ovoid, 4-5 x 2.5-4 µm thin-walled, in light microscope appearing smooth or with very fine warts (observe in cotton blue or Melzer), light to strongly amyloid.
HABITAT. On the ground in grasland, probably a grasparasite. DISTRIBUTION. Widespread in the subtropics and tropics, specimens recorded from USA, Jamaica, Bermuda, West Indies, Brazil, Venezuela, Nigeria, Kenya, Tanzania, Pakistan, India and Sri Lanka.
REMARKS. The whitish to ochraceous fruitbody growing in grassland, often with an irregular tapering base, should be a good field characteristic. It could be confused with Heteroporus biennis, but this species has smooth, nonamyloid spores.
Taxon name: