[Vol. 12 

 272 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



British Columbia: Sidney, J. Macoun, 879 (in Mo. Bot. Gard. 



Herb., 55330). 

 Oregon: Tidewater, S. M. Zeller, 1983 (in Mo. Bot. Gard. Herb., 



58760). 

 California: Berkeley, C.J. Humphrey, 5987, 5990; Redding, C. J. 



Humphrey, 6038; Santa Barbara, 0. M. Oleson, 10. 

 Cuba: Home (in N. Y. Bot. Gard. Herb., and Mo. Bot. Gard. 



Herb., 61464). 

 Porto Rico: Rio Piedras, /. A. Stevenson, 5792 (in Mo. Bot. Gard. 



Herb., 54693); Sabana Liana, /. A. Stevenson, 6058 (in Mo. 



Bot. Gard. Herb., 54686); Vega Baja, /. .4. Stevenson, 5693 



(in Mo. Bot. Gard. Herb., 54692). 



51. P. hiulca Burt, n. sp. 



Type: in Burt Herb, and probably in N. Y. Bot. Gard. Herb. 



Fructifications long and widely effused, thick, membranaceous, 

 separable when moistened, becoming light buff to warm buff in 

 the herbarium, widely cracked, the margin determinate, some- 

 what tomentose; in section 250-1400 [jl thick, not colored, 2- 

 layered, with a very thick layer next to the substratum of 

 densely interwoven, longitudinally arranged and somewhat as- 

 cending thin-walled, hyaline hyj^hae 3-4 [j, in diameter, not in- 

 crusted, not nodose-septate and with the hymenial layer thinner 

 — only 100-200 \x thick — and containing in all portions very nu- 

 merous cystidia; no gloeocystidia ; cystidia incrusted, somewhat 

 conical, 30-50 X 6-12 ^, very numerous, wholly immersed or 

 protruding up to 30 (x; basidia with 4 sterigmata; spores hyaline, 

 even, 4i]4r^ X 3 ;i. 



Fructifications 4-12 cm. long, 2-4 cm. wide — perhaps larger for 

 all specimens received are fragmentary. 



On bark and decaying wood of frondose species. Mexico and 

 the West Indies. November to May. 



P. hiulca has large, conspicuous fructifications with somewhat 

 the color and aspect of P. mutata and P. Roumeguerii. The 

 absence of gloeocystidia and the smaller spores distinguish it from 

 the former, and the comparatively thin hjTnenial layer to which 

 cystidia are restricted and the very thick layer of interwoven 

 hj^phae running in all directions, rather than predominantly 

 erect, from P. Roumeguerii. 



