100 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



the largest specimen of S. exiguum. While differences in size 

 are not generally a good criterion for specific distinction, I am 

 inclined to think that they will prove so in this instance. 



Specimens examined : 

 New York: Westport, C. H. Peck, type (in N. Y. State Mus. 

 Herb, and in Burt Herb.). 



12. S. tenerrimum Berk. & Ravenel, Grevillea i : 162. 1873; 

 Sacc. Syll. Fung. 6: 551. 1888; Massee, Linn. Soc. Bot. Jour. 

 27: 165. 1890. Plate 2, fig. 11. 



Type: in Kew Herb, and Curtis Herb. 



Pileus coriaceous, thin, infundibuliform or flabelliform, soon 

 lobed and split, upper surface slightly rough, fibrillose-striate, 

 not zonate or only very indistinctly "pale tan" when collected, 

 becoming tawny olive to Saccardo's umber in the herbarium; 

 stem filiform, whitish, bearing some fibrils towards the base; 

 hymenium even, concolorous, setulose with hyaline hairs 

 under a lens; pileus in section 300 ju thick, composed of longi- 

 tudinally and densely arranged hyaline hyphae 3 jjl in diameter ; 

 cystidia hair-like, not incrusted, 4-8 /x in diameter, protruding 

 30-50 /x; spores hyaline, even, subglobose, 4-5X3-4/*. 



Fructifications 2-10 mm. broad, 5mm.-2| cm. high; stem 

 3-7 mm. long, J-J mm. thick. 



On ground among mosses. New York, Wisconsin, South 

 Carolina, and Cuba. July to November. Rare. 



The collections which I have referred to S. tenerrimum are 

 from the widely separated localities stated above and only a 

 single gathering of several fructifications at each locality. There 

 are slight differences between the specimens of the several 

 gatherings, but not great enough to preclude their reference 

 to a single species, although doing so has required some general- 

 ization from the original description. 



S. tenerrimum is related to S. undulatum of northern Europe 

 as known to me by the specimens distributed in Karsten, Fungi 

 Fennicae, 912, and by the extended account by Maire, Ann. 

 Myc. 7: 426-431, text f. 1, 2. 1909, but the latter species 

 attains much larger size, has a coarser stem, and is infundibuli- 

 form with central stem. None of the collections of S. tenerri- 

 mum are composed wholly of specimens with infundibuliform 



