[Vol. 12 

 266 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



O 46. P. affinis Burt, n. sp. 



Name without description in Peck, N. Y. State Mus. Bui. 54: 

 954. 1902. 



Type: in Burt Herb. 



Fructifications broadly effused, membranaceous, adnate, sepa- 

 rable when moistened, drying light buff to pinkish buff and light 

 pinkish cinnamon, often cracked and showing the paler subiculum 

 in the crevices, the margin paler, radiately fibrillose; in section 

 not colored, 300-500 y. thick, with the hyphae hyaline, 3-5 \l in 

 diameter, not at all incrusted, arranged densely and longitudi- 

 nally in a broad layer along the substratum and then ascending 

 obliquely into the hymenial layer; cystidia incrusted or not in- 

 crusted, 30-60 X 5-8 \l, protruding up to 30 \l, occurring in the 

 hymenial layer only; spores white in a spore collection, even, 

 4^-6 X 23^-3 (i. 



Fructifications 3-20 cm. long, 2-4 cm. broad. 



On bark and decorticated logs and limbs of frondose species. 

 Canada to New York and westward to Oregon, and also in 

 Europe. July to October. Common. 



P. affinis is related in aspect to P. laevis and has hyphae of the 

 same diameter and arrangement as those of the latter species but 

 not at all incrusted. The fructifications of P. affinis are usually 

 thicker than those of P. laevis, less adnate to the substratum, 

 paler and more cracked. Pale specimens of P. sanguinea crack 

 into somewhat similar areas but show a somewhat colored, floc- 

 cose subiculum in the fissures. The hyphae of P. affinis are of 

 smaller diameter than those of P. velutina. 



Specimens examined: 

 Exsiccati: Reliq. Farlowianae, 343, under the name Peniophora 



laevis. 

 Sweden: L. Romell, 123 , 124, both under the name P. velutina. 

 Austria : Tirol, V. Litschauer, under the name P. laevis. 

 France: Allier, H. Bourdot, 8579, under the name P. laevis. 

 Canada: J. Macoun, 76, comm. by N. Y. State Mus. Herb, (in 



Mo. Bot. Gard. Herb., 57510). 

 Quebec: Hull, J. Macoun, 220. 

 Ontario: Jefferson, G. H. Graham, comm. by Univ. Toronto 



Herb., 674 (in Mo. Bot. Gard. Herb., 44924). 



