[Vol. 5 



364 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fig. 30 



H. opaca. 



Section X 68. From type. 



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 young 

 slightly velvety, very thin, and between bister and Vandyke- 

 brown, finally becoming glabrous, somewhat thicker, Vandyke- 

 brown and cracked, the margin 

 thinning out; in structure 200-300 

 \i thick, lacking an intermediate 

 layer, with the setigerous layer very 

 dense and opaque and composed of 

 suberect, interwoven, dark hyphae, 

 and of setae; setae 50-90x8-10 n, 

 emerging up to 60 /x, starting from 

 all parts of the setigerous layer; 

 spores hyaline, even, 3|-5xli-2 ii. 

 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. corrugata 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. d Edna L. Murrill, 297, comm. 

 by N. Y. Bot. Gard. Herb.; Cinchona, W. A. <& Edna L. 

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

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

 N. Y. Bot. Gard. Herb. 



35. H. tenuis Peck, N. Y. State Mus. Eept. 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- 



