1925] 



BURT — THE THBLEPHORACEAE OF NORTH AMERICA. XIV 257 



40. P. laevis (Fr.) Burt in R. Fries, R. Sci. Soc. Gothoburgens 

 Actis IV. 3: [36]. 1900; in Peck, N. Y. State Mus. Bui. 54: 954. 

 1902; V, Hohnel & Litschauer, K. Akad. Wiss. Wien Sitzungsber. 

 115: 1550. 1906; Bourdot & Galzin, Soc. Myc. Fr. Bui. 28: 

 398. 1913; Rea, Brit. Basid. 692. 1922. 



Thelephora laevis Fries, Elenchus Fung. 1: 206. 1828. Not 

 T. laevis Persoon. — Corticium laeve Fries, Epicr. 560. 1838; 

 Hym. Eur. 649. 1874. — Kneiffia laevis (Fries) Bresadola, Ann. 

 Myc. 1 : 99. 1903. 



Type: authentic specimen in Kew Herb. 



Fructifications effused, membranaceous, adnate, separable 

 from the substratum when moistened, drying light pinkish cin- 

 namon to buff-pink and ochraceous buff, the margin radiately 

 fibrillose; in section not colored, 300-400 [j. thick, with the hyphae 

 3-43^ [i in diameter, not colored, granule-incrusted, densely 

 crowded together and running parallel with the substratum and 

 then ascending obliquely into the hymenium ; cystidia incrusted 

 or not incrusted, 40-60 X 43/^-9 [i, protruding up to 30 [l, con- 

 fined to the hymenial layer; spores white in a spore collection, 

 even, 4^-6 X 23^-3 [x. 



Fructifications 2-10 cm. long, 2-4 cm. broad. 



On bark of frondose species. Europe, New Brunswick to 

 Texas and westward to Washington and Oregon, in Cuba and 

 in Island of Guam and in Japan. July to October. Not com- 

 mon. 



Peniophora laevis is one of the species which Karsten under- 

 stood as Corticium radiosum and sent under this name to Fries, 

 as shown by the specimens in Herb. Fries determined by Karsten, 

 and preserved by Fries without comment. Bresadola collected 

 the species occasionally and communicated to me duplicates under 

 the herbarium name Peniophora alho-gilvida. The above speci- 

 mens agree in aspect with the authentic specimen of Corticium 

 laeve from Fries in Kew Herb, and also agree with it in the details 

 of microscopic structure including incrusted hyphae, smaller than 

 those of Peniophora coccineo-fulva and more compactly and more 

 longitudinally arranged than those of P. sanguinea. P. affinis 

 does not have its hyphae at all incrusted. 



Specimens examined: 



