[Vol. 12 

 318 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



On decaying wood and bark of frondose species more usually. 

 Europe and Massachusetts. July to December. Rare. 



P. tenuis is doubtfully distinct from P. pertenuis, having the 

 same aspect and microscopical characters except that some of 

 the cystidia have incrusting granules at the tips, as shown in 

 the figures by Patouillard cited above. 



Specimens examined: 

 Germany: Westphalia, Lengerich, W. Brinkmann, comm. by 



Bresadola. 

 Austria: Tirol, V. Litschauer. 

 France: Allier, St. Priest, H. Bourdot, 6530; Aveyron, A. Galzin, 



11689, comm. by H. Bourdot, 18554. 

 Massachusetts: Brookline, Hammond's Pond, G. R. Lyman, 188. 



89. P. serialis (Bres.) v. Hohnel & Litschauer, K. Akad. Wiss. 

 Wien Sitzungsber. 116: 777. 1907. 



Kneiffia serialis Bresadola, Ann. Myc. 1 : 101. 1903 (in part); 

 Sydow, Myc. Germ., 1. 1903. Not Xerocarpus Cacao Karsten, 

 Hedwigia 29: 271. 1890. An Corticium seriate Fries, Epicr. 

 563. 1838? Corticium seriate (Bres.) Bourdot & Galzin, Soc. 

 Myc. Fr. Bui. 27: 253. 1911 (Forme 2). 



Type: type distribution in Sydow, Myc. Germ., 1. 



Fructifications long and widely effused, thin, closely adnate, 

 very variable in color, smoke-gray and pale olive-buff to wood- 

 brown in the herbarium, even, sometimes cracked; the margin 

 thinning out, indeterminate; in section 60-180 \l thick, not colored, 

 composed of densely arranged, erect hyphae about 3 y. in di- 

 ameter, with the outer portion of the wall gelatinously modified 

 and indistinct, and of some scattered, yellowish or brownish, 

 somewhat spherical masses 9-12 y. in diameter, immersed near 

 the substratum; gloeocystidia in the unusual form of irregular, 

 immersed spherical masses 9-12 p. in diameter; cystidia not in- 

 crusted, tapering to a sharp apex, 3-5 \l in diameter, protruding 

 up to 30 ja; spores hyaline, even, curved, 4-6 x 1-2 p.. 



Fructifications 3-12 cm. long, 2-5 cm. wide. 



On decaying wood of logs of Pinus, Abies, Tsuga, and Thuja. 

 Europe, New York, and Washington. August to May. 



P. serialis resembles in aspect P. Cacao and Corticium lividum; 



