128 Journal of the Mitchell Society [Jnne 



our material. It does not seem to have been reported from either of 

 the Carolinas before, but has been found in the District of Columbia 

 and as far south as Cuba. It is said to grow on apple, pear and 

 peach, as well as other trees. 



4279. On live branches of Q. PhelJos, Rocky Ridge Farm, April 2-3, 1920. 

 4294. On the same tree as No. 4279, May 3, 1920. 



Hartsville, S. C, on water oak (Q. niger), December 2"), 1919. Coker. 



3. Septobasidium Schweinitzii Burt 



This is much like S. pseudopedicellatum, but is said to differ in the 

 tips of the paraphyses being upright instead of bent and interwoven 

 horizontally. It was originally described from North Carolina as 

 Thelephora pedicellato. We have not found it. 



North Carolina. Schweinitz. 



SIROBASIDIACEAE 



Plant gelatinous, soft, pulvinate, small ; basidia arranged in chains, 

 divided either into two cells by an oblique septum or into four cells 

 b}^ two longitudinal septa, each cell producing one spore. There is 

 but one genus. 



SIROBASIDIUM 



As there is but one genus, it may be defined as having the char- 

 acters of the family. We have found one species in Chapel Hill, and 

 as the genus has heretofore been known only from South America, 

 this adds a genus to the North American flora so far as reported, but 

 Dr. Farlow has collected a minute species of this genus, practically 

 invisible without a lens, on twigs of Viburnum (?) at Choeorua, N. H. 



Sirobasidium Brefeldianum MoUer 



Plate 55 



Forming minute, little pustules about 0.4-1.3 mm. in diameter and 

 0.2-0.5 mm. high, gregarious but not crowded, smooth, softly gelatin- 

 ous, not viscid, but slippery, watery-smokj' to dusky white (with a 

 tint of flesh in some). 



Spores ovate, smooth, hyaline, varying in size, most about 7.5-8.1 x 

 13.3-13.7/;t, sprouting soon to form small oval sporidia. Basidia 10.5- 

 12.6x22-40//,, borne up to 6 (or more ?) in chains, pear-shaped, 

 usually with a narrowed base, divided into two cells by an oblique 

 cross wall, each cell sprouting near the apex to form a single spore. 



