22 
IOWA ACADEMY OP SCIENCE 
Mr. Learn near Clermont makes this treatment of the forms impossible as the 
habit is that of F. nigricans; but with the brown hymenium of the typical 
form. At most these can be ranked only as varieties. The typical form is a 
wound parasite on Juglans cinerea and Ostrya virginica, while the other form 
is confined to PopuUis. 
28. Pysopoluporus fulvus (Scop.) Murrill. {Femes fulvus Gill). 
Very common on the wild plum, destroying entire thickets, and sparingly on 
cultivated plums of American and European varieties. 
29. Pyeopolyporus Everhabtii (Ellis & Gall.) Burrill. {Mucorniporus 
Everhartii Ellis & Gall., Femes rimesus and F. ignarius Aut. p. p.) 
This is a very common parasitic species, often reaching a large size. It is 
parasitic on various species of Quercus. 
30. Pyeopolyporus conchatus (Pors.) Murrill. 
Very common about Payette. This is a very variable species, either peliate 
or resupinate, and in peliate forms often moss covered. The velvety fawn or 
light brown margin is quite characteristic. Very common as a parasite on 
Grategus, wild grape, ash, and as a saprophyte upon various species of deciduous 
wood. 
31. Elfvingia fomentaria (L.) Murrill. {Femes fementarius Gill). 
A specimen from Betula papyrifera is in the collection of Upper Iowa Uni- 
versity. 
32. Elfvingia lobata (Schw.) Murrill. {Femes renifermis Morgan). 
Not rare on dead deciduous wood. This species is an annual, the pelei becom- 
ing imbricate. It is easily distinguished from the following by this character 
and its smaller size. 
33. Elfvingia megaloma (Lev.) Murrill. {Femes applanatus of American 
authors). 
Very common both as a parasitic and saprophyte on various deciduous trees. 
34. Cereena unicoloe (Bull.) Murrill. {Daedalea nniceler Pries). 
A very common saprophyte on various species of deciduous wood. It is 
easily mistaken for a Cerielus from which it differs in the daedaleoid pores. 
35. Daedalea confeagosa (Bolt.) Pers. 
Very common both as a parasite and saprophyte on Salix and Grategus. 
36. Lenzites betulins (L.) Pries. 
Very common on oak and rare on birch. 
37. Lenzites odora “Aut.” 
A poorly understood species of uncertain affinities. Common on railroad ties 
and structural timber. 
38. Gleophyllum trabeum (Pers.) Murrill. 
Common oh fallen timber. 
