342 



[Vol. 3 



ANNALS OF THE MISSOURI BOTANICAL GAEDEN 



Fig. 13 

 S. canescens. 

 p, hypha in hymenial 

 surface bearing probasi- 

 dia; ft, two spore-bearing 

 organs; s, spores. X 

 640. 



16. S. canescens Burt, n. sp. 

 Type: in Mo. Bot. Gard. Herb. 



Fructification resupinate, effused, 

 coriaceous, cottony, pubescent, white 

 at first, pale olive-buff in the herbar- 

 ium, the margin thinning out; in 

 structure 500-900/4, thick, with the hy- 

 phae hyaline, even, 4i/2/* in diameter, 

 densely interwoven next to the sub- 

 stratum, suberect, or ascending 

 obliquely and loosely interwoven to 

 the hymenial surface and there bear- 

 ing probasidia laterally among slight- 

 ly curved hyphal branches about 2ix in 

 diameter ; probasidia hyalinej^ subglo- 

 bose, Ib-llii in diameter, producing a 

 few-celled organ 71/2^ in diameter, up 

 to 60/x long, which bears spores on its 

 upper three cells; spores simple, hyaline, even, curved, 15-20 

 X 51/2-6/.. 



Fructifications about 2-4 cm. long, I-II/2 cm. broad, some- 

 times arranged more or less interruptedly for up to 25 cm. 

 along the under side of limbs. 



Associated fairly constantly with scale insects on small 

 living branches of Quercus on a residence street, Pasadena, 

 California. November to March. 



S. canescens is characterized by its white to whitish color, 

 cottony structure, and pubescent surface. Spores were ob- 

 served attached to one or more of the upper three cells of 

 the spore-bearing organ but with the terminal cell giving the 

 most indication of spore production. I am indebted to Prof. 

 H. S. Fawcett for the collection made in March to show this 

 species in best fruiting condition. 



Specimens examined: 

 California: Pasadena, H, 8, Fmvcett, comm. by W. A. 

 Setchell (in Mo. Bot. Gard. Herb., 44037) ; same locality, 

 A, G. Smith, comm. by H. S. Fawcett (in Mo. Bot. Gard. 

 Herb., 44246). 



