[Vol. 2 



734 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



tough consistency and by lack of brittleness. The longitudin- 

 ally septate basidia afford a decisive character in all doubtful 



cases. 



The specific distinctions between the more common species 



of this genus are based largely upon the form of mature and 

 well-developed fructifications ; very young, deformed, or frag- 

 mentary specimens can not be referred very confidently to 



their species. 



Key to the Species 



Fructifications branched when well developed. Simple forms may l>e 

 present when very young or in the same colony with normal branched 



forms 



Fructifications simple 4 



1. Fructifications normally cespitose, more or less grown together 2 



1. Fructifications solitary or scattered 3 



2. 



With pileate divisions flattened, grown together at many points of 



contact, forming rosette-like masses 2-15 cm. in diameter. .1. T. pallida 

 With the stems crown together into a main stem 2-10 mm. thick; 



m 



pileate divisions cylindric, spreading, grown together at only few 

 points of contact; the smaller divisions about \y> mm. thick 



2. T. candidum 



2. Sometimes with both stems and pileate divisions grown together into 

 compact bundles, usually merely closely cespitose and with the 

 branches intricately intertangled; much slenderer than preceding 



species and with the habit of Pterula 5. T. mcrismatoides 



3. Stem about l 1 /. mm. thick, palmately few-branched; branches once or twice 

 similarly branched, cylindric or sub< ylindric, often channelled on the 

 upper side; basidia 15X9 /x; spores 9-15X4%-6 /i, pointed at the base 

 nly 8. T. Cladoma 



3. Stem about %-l mm. thick, sometimes with occasional, scattered, divergent 

 branches from its side, dilated at the upper end, divided into a few, short, 

 finger-shaped branches; basidia 20-24X12-14 fi; spores 14-10X0-7 n, 



pointed at both ends, Known from Jamaica only h- T. tenue 



4. Fructification dark orange, probably with medullary tissue pale as in 

 all the preceding species; basidia subglobose, 10-12 /x in diameter 

 6. T. aurwntium 



4. Fructification black with the exception of the hymenium; hynienium 

 olive-ocher, amphigenous on the lower third of the fructification; 

 basidia 11X7 p. Known from Porto Rico only 7. T. simplex 



1. Tremellodendron pallidum (Schw.) Burt, n. comb. 



Plate 26, fig. 6. 



Thelephora {Merisma) pallida Schw. Am. Phil. Soc. Trans. 



N. S. 4: 166. 1834.— T. Schweinitzii Peck, N. Y. State Mus. 



Kept. 29: 67. 1878; Saccardo, Syll. Fung. 6: 534. 1888.— 



Tremellodendron Schweinitzii (Peck) Atk. Jour. Myc. 8:106. 



1902. 



Illustrations: Hard, Mushrooms /. 381.— Moffatt, Chicago 



Acad. Sci. Bui. 7 : pi 22. f. 1. 1909. 



