440 



BASIDIOMYCETES. 



luiiny geiu'rally grow near each other. The pores have a torn 

 margin and cystids are frequent between the basidia. 



The sporophores are common in spruce plantations, and are 

 accompanied by a very characteristic wood-destruction. The 

 wood, in the earlier stages, becomes brownish-yellow and inter- 

 sected by radial and vertical canals filled with a white mycelium 

 (Fig. 270). Gradually, however, it breaks up into small cube- 



Fir.. 270. l'l,l„,H„ LI. I,U,,UU^. D^slUlLtlUll Uf 



Spi-uce-w()i)d. The white iiiycehiiiii is present, 

 dividing the dec.iycd wood into cubical pieees. 

 (v. Tubeuf phot.) 



l''ii;. ■ITl. — l'oli/jiorus Ijorcaliti. Later stage 

 of destruction. The Spruee-wood is broken 

 up Into cubical pieces, and the mycelium has 

 disapjieared. (v. Tubeuf phot.) 



like pieces, particularly evident when the wood is liroken (Fig. 

 '271). Tlie cell-walls are dissolved from the eell-cavity out- 

 wards, the lignitied wall being first converted into cellulose and 

 disa[)pearing, finally the middle lamella. 



Polyporus dryadeus Fr.^ (P. 2y-^("i'(^oiffniarws Bull.) (IJritain 

 and U.S. America). Sporophores, annual, large, shaped likt- 

 tubers or hoofs, and generally situated towards the base of the 



^R. Hartig, Zer-^etztiw/sersrheinimgen, PI. XN'II. A common Rriti.sli species. 



