TYLOSTOMATACEAE 155 



Illustrations: Lloyd. As cited above. 



6060. By white oak tree in pasture, upland woods, Feb. 9, 1923. 



Tylostoma volvulatum Borsch, in Sorokine. Slender form 



Plate 119 



Peridium up to 1 cm. thick, covered until age with a rather thin, brown, sandy coat 

 which wears away slowly and about equally over the surface, exposing the nearly white 

 inner peridium. Mouth plane, not regularly circular, margin clean and smooth, single 

 in all nine plants of our collection. There is no cortical cup at the base of the peridium. 

 Collar short, fimbriate. Stem 2-3 cm. long, 1.5-3 mm. thick, with a brown, more or 

 less scaly but not conspicuously lacerate surface, cespitose at times, in which cases the 

 peridia may be fused. 



Spores subspherical, irregular, somewhat angled, practically smooth (even under 

 oil immersion), 4.2-5.5 x 5-7.4/*. Capillitium threads very irregular, nearly hyaline, 

 paler than the spores, up to 5n thick, with walls of varying thickness. 



This agrees very well with T. volvulatum as treated by Lloyd (Tylostomeae, p. 

 19, pi. 81) except for more slender aspect. The mouth is almost exactly like that of our 

 Xo. 6060 (T. Finkii), as well as of the T. volvulatum-cespitosum-americanum group. 



Illustrations. Lloyd. As cited above. 



Sorokine. Revue Myc, 1890, pi. 98, figs. 347, 348; pi. 101, fig. 353a. 



Porto Rico. Seaver and Chardon, colls. No. 142. (N. Y. B. G. Herb, and U. N. C. Herb.) 



Tylostoma poculatum White 



Plate 119 



Miss White reports this species from Alabama (1. c, p. 431). We have examined 

 what appears to be a true example of the species from Calloway, Nebraska (Bates, 

 coll.; E. & E., Fungi Columbiani, No. 1889). The spores are quite smooth, irregularly 

 subglobose, 4— 5/x thick, with the contents precipitated or fragmented into irregular 

 particles which at first sight give somewhat the appearance of wrinkles on the surface. 

 We find no actual wrinkles as figured by Miss White. Tylostoma obesum Cke. & Ell. 

 is so close that we hardly see how the two can be separated. The spores of the Ellis 

 plant at N. Y. Botanical Garden, mentioned by both Miss White and Lloyd, have been 

 examined by us and found to be exactly like those of T. poculatum in size, shape, and 

 surface, the contents differing somewhat in being less coagulated (pi. 119, fig. 12). 

 Tylostoma granulosum of Europe is also very close. As represented by D. Saccardo 

 (Mycotheca italica, No. 424) the spores are smooth and just like those of the American 

 plants mentioned above, spherical to slightly irregular, 3.7— 1.4/j thick (pi. 119, fig. 13). 

 Lloyd gives the spores of T. granulosum as granular and Hollos gives them as warted. 

 Miss White's description of T. poculatum follows (Bull. Torr. Bot. Club 28: 431. 

 1901): 



"Peridium globose, somewhat depressed, 1-1.5 cm. high, 1-2 cm. in diameter, 

 smooth, fawn-colored, membranaceous; outer peridium scaly, but more persistent than 

 in most species, remaining in the shape of a cup-like involucre round the base of the 

 peridium, mouth slightly raised, fimbriate, mostly large: collar entire, inconspicuous: 



