448 



COMPARATIVE MORPHOLOGY OF FUNGI 



The second group of the Polyporaceae with labyrinthiform pores, 

 shares the fate of the first group in its systematic disorder. Here only 

 three genera will be discussed, Daedalea, Lenzites and Favolus. In the 

 two former, the fructifications are woody, leathery or corky, in the latter 



Fig. 289. — Lenzites abietina. Resupinate fructification. At a, lie numerous denticu- 

 late hymenial fundaments, at b, somewhat older radiating fructifications, at c, irregularly 

 assembled fructifications with common growth zones. ( X ^5; after Falck, 1909.) 



more or less fleshy; in all three they are perennial, rarely resupinate, usu- 

 ally brackets. In Daedalea the folds are labyrinthiform, seldom almost 

 lamelliform; in Lenzites (Figs. 289 and 290) they are chiefly formed as 

 definitely radiating lamellae (even though still tortuous), which from time 

 to time anastomose leaving between them lengthwise slits where alone 



the hymenium develops. At the edge of 

 the fructification, the partitions are often 

 closer so that the hymenophore becomes 

 more poroid. Occasionally the lamellae 

 develop to serrate elevations and then 

 appear quite similar to Phlebia. In the 

 predominantly tropical Favolus, the la- 

 mellae are similar to those of Lenzites 

 except that they anastomose regularly 

 forming a faveolate network which is 

 even more regular in Hexagonia. In 

 Cyclomyces, the lamellae are arranged 

 in concentric circles. Favolus europaeus 

 is a parasite of nut trees, Daedalea quer- 

 cina a parasite of oaks and chestnuts. 

 Lenzites saepiaria cause a very serious 

 decay of coniferous timbers in buildings, 

 where it assumes the importance of Merulius 



Fig. 290. — Lenzites abietina. Mus- 

 sel shaped fructifications on fir beam. 

 At b, several have coalesced to form a 

 bracket. (Natural size; after Falck, 

 1909.) 



especially in America 

 lacrymans in Europe. 



As far as the representatives of this group have been investigated, e.g., 

 by Falck (1909), Zeller (1916), both in their natural habitats and in cul- 

 tures (similar to the other Polyporaceae), they pass successively through 



