[Vol. 5 

 364 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Herb.) ; Alto Cedro, Underwood & Earle, 1527, comm. by N. 

 Y. Bot. Gard. Herb. 



34. H. opaca Burt, n. sp. 



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

 Fructifications resupinate, effused, adnate, when 

 slightly velvety, very thin, and between bister and VaL 

 brown, finally becoming glabrous, somewhat thicker, Vandyke- 

 brown and cracked, the margin 

 thinning out; in structure 200-300 

 n thick, lacking an intermediate 

 layer, with the setigerous layer very 

 dense and opaque and composed of 

 suberect, interwoven, dark hyphae, 

 Fig. 30 and of setae; setae 50-90x8-10 /z, 



o .. ^' r^^^^' . emerging up to 60 n, starting from 



Section X68. From type. ^ ^^ \, ^. \. ^, 



all parts of the setigerous layer; 

 spores hyaline, even, 3^-5x1^-2 /*. 



Fructifications 3-5x1-2 cm. 



On bark of dead frondose limbs. Wet, wooded region, 

 2000-4000 ft. altitude. Jamaica. December and January. 



H. opaca belongs in the group with H. cor rug at a and H, 

 tenuis, from both of which it differs by its velvety surface 

 when young, different color, darker hyphae, and denser and 

 more opaque structure in sectional preparations. 



Specimens examined: 

 Jamaica: Chester Vale, W. A. <& Edna L. Murrilly 297, comm. 



by N. Y. Bot. Gard. Herb. ; Cinchona, W, A.'S Edna L, 



Murrill, 538, type, comm. by N. Y. Bot. Gard. Herb. ; Troy 



and Tyre, W. A, Murrill S W. Harris, 923, 937, comm. by 



N. Y. Bot. Gard. Herb. 



./-^:-35. H. tenuis Peck, N. Y. State Mus. Rept. 40 : 57. 1887; 

 Sacc. Syll. Fung. 6 : 599. 1888 ; Massee, Linn. Soc. Bot. Jour. 

 27 : 109. 1890. 



Type: in N. Y. State Mus. Herb. 



Fructifications resupinate, effused, becoming confluent, very 

 thin, adnate, somewhat cracked, velvety, drying from raw 

 umber to mummy-brown, the margin thinning out, indeter- 



