450 



BASIDIOMYC'ETP> 



The two species are held by many autliors to he identical. 

 It occurs chiefly on steins of beech, also on oak and bircli. 

 In regard to its parasitism nothing further is known. 



Polyporus (Fomes) annosus Fr. (Trametes radiciperda 

 Hartig^) (Uritoin and I'.S. America). 'I'lie sporophores vary 

 much in form, according as they occur more above or more 

 below ground on tree stems, or on timber in mines. The 

 upper surface is brown and marked in zones, the margin l:>eing 

 lighter. The section through the woody sporophore is white. 

 The hy menial layer is also white. Spores ovoid and colourless, 

 germinating easily in water. In artificial cultures, Brefeld 

 states- that they produce only conidia. 



Fio. 'iSl. -I>o!i/j)o,-u.^ annosus Fr. (Trametes radkijv ala llartig). Stool of a 

 forty-year Spruce, which lias been dead for two or three years. The sporophoi e 

 is several years old. a, a, White open-pored layer forming over the dead basidial 

 layer, h, h; at r a narrow strip of wood still remains firm, the remainder i.s 

 completely destroyed and rotten. (After R. Hartig.) 



This species was first investigated in detail by 1(. Hartig,^ 

 and is described by him as the most dangerous of all parasites 

 in the conifer forest. It is most frequent on Conifers, e.//. pine, 

 Weymouth pine, spruce, silver fir, Douglas fir, balsam fir, 

 juniper, and Thvja ; it also occurs on various broad-leafed trees, 

 e.g. beech ^ and hawthorn. 



'R. Hartig, Zersetztinrj)ierKcheinwu/en, PI. I. -IV. 

 III. Zeituchrift f. Forst-und Jagd-wesen, l.SS",>, p. 

 XLii., 1890. 



IVichligti Krankheiten, PI. 

 4'2S. Botan. Centralhlat I . 



-Brefeld, Schimmelpihe, Heft 8, 1889. 



' Rostrup, Afbildninri o;/ Beskrivthe af dv fari'njMt Siiyllesrampe, 



