368 Murrill: Polyporaceae of North America 



Ml 



noponis by Ellis on account ot its spiny hymenium, Dut ir is oesi 

 known as a Trainctcs. Besides its published specific names sev- 

 eral manuscript names have been assigned to it, among which are 

 Poly poms gausapahts Berk. & Rav. on pine, Dacdalca vorax Hark- 

 ness on Abies Douglasii in California and Dacdalea vetusta Ell. & 



Ilark., on white cedar in New Jersey. 



It seems that this plant is more sensitive to changes in host 

 than almost any other of its kind. One would expect a parasitic 

 species like this to show more variation than an ordinary dead- 

 wood species, but the forms here assumed on different hosts and 

 even on the same host under different conditions are surprisin 

 I am supposing that the range of forms found on pine, spruce and 

 other conifers represent a single species. They have all seemed 

 so to me, and Dr. Schrenk expects shortly to prove their identity 

 by the completion of a series of inoculation experiments covering 

 various hosts. 



The present species is too well known throughout both Europe 

 and America as a destructive parasite of coniferous trees to re- 

 quire a Hst of specimens collected. All published exsiccati cover- 

 ing the group contain it and fresh material may be gathered in 

 almost any locality. 



6. ELFVINGIA Karst. Finlands Basidsv. 333. 1889. 



Elfvingia lipsiensis ( Batsch ) M 



Xylopihi 



Xylopihis 



37 : 69. 1882. 



Hymenophore large, epixylous, sessile, applanate or ungulate ; 

 surface sulcata, horny-encrusted : context brown, punky ; tubes 

 brown, cylindrical, stratose, thick-walled, mouths whitish when 

 young ; spores brown, rarely hyaline ; conidia present m most 

 species on the surface of the pileus. 



Species : E. fomentaria (L.) Murr., E . fasciata (Sw.) Murr., 



E. rcniformis (Morg.)Murr., E, megaloma (Lev.) Murr., E. tornata 



(Pers.) Murr., E. Lioiinctii (Rolland) Murr. [see Bull Torrey 



Club 30: 296-301. 1903]. 



Pohfortis 



P. lobai 

 Schrad. 



Elfvingia renifi 



lobatus 



