[Vol. 12 

 236 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



mew, Fungi Col., 3135; Olympia, C. J. Humphrey, 6311; 

 Sedro-Woolley, C. J. Humphrey, 7464. 



California: Claremont, /. M. Johnston, comm. by L. O. Over- 

 holts, 3645 (in Mo. Bot. Gard. Herb., 54699); Santa Catalina 

 Island, L. W. Nuttall, 522b (in Mo. Bot. Gard. Herb., 57622). 



Mexico : Guernavaca, W.A.&E.L. Murrill, 391, comm. by N. Y. 

 Bot. Gard. Herb, (in Mo. Bot. Gard. Herb., 54548); Orizaba, 

 W. A. & E. L. Murrill, 756, comm. by N. Y. Bot. Gard. Herb, 

 (in Mo. Bot. Gard. Herb., 54644). 



19. P. Thujae Burt, n. sp. 



Type: in Burt Herb. 



Fructifications effused, thin, closely adnate, white, sometimes 

 becoming cartridge-buff in the herbarium, the margin thinning 

 out; in section 40-150 \l thick, not colored, with the hyphae 

 loosely arranged, suberect, interwoven, 2-3 pi in diameter, 

 nodose-septate, thin-walled, becoming incrusted in a subhymenial 

 zone; no gloeocystidia; cystidia hair-like, not incrusted, 3 \l in 

 diameter at the base, tapering upward and sometimes some- 

 what capitate at apex, protruding 20-30 y. beyond the basidia; 

 spores white in a spore collection, 4-5 X 3 \l. 



Fructifications 2-6 cm. long, 1-2 cm. wide, on trunks of 

 Thuja, more rarely on Juniperus and Pinus Strobus. Canada to 

 Massachusetts, and westward to Missouri. July to October. 

 Occasional. 



P. Thujae may be recognized by its thin, white fructifications 

 on white cedar, with microscopic structure as stated. It differs 

 from Peniophora Sambuci in having thinner fructifications, not 

 becoming granular and pruinose, cystidia numerous, and in oc- 

 currence on a coniferous substratum. 



Specimens examined: 

 Canada: J. Macoun 62; St. Lawrence Valley, J. Macoun, 68, 80; 



Ottawa, J. Macoun (in N. Y. State Mus. Herb., and Mo. Bot. 



Gard. Herb., 55813), and 45, and J. M. Macoun (in N. Y. 



State Mus. Herb., and Mo. Bot. Gard. Herb., 56078) ; Quebec, 



Hull, J. Macoun, 173. 

 Vermont: Middlebury, E. A. Burt, 3 gatherings, one of which is 



the type. 



