White : Tvlostomaceae of North America 435 



dium, which is tomentose on the lower half and not depressed, 

 and by its stem which is distinctly furrowed on the lower half." 



As this species was not seen the above original description is 

 quoted. The same is the case with the following description of 

 T. Wrightii, and the species which Morgan calls u T. Meyenianum." 

 It has been thought best to include these descriptions in order 

 that our present knowledge of the group may be accessible in a 

 single paper. 



17. Tylostoma Wrighth Berk. Grevillea, 19: 95. 1891 



"Stem 6 cm. high, 4 mm. thick, hollow, equal, ochraceous, even, 

 glabrous ; peridium spherico-depressed, 2 cm. broad, minutely 

 umbonate, pale, ochraceous, glabrous, the wall of the umbo dis- 

 appears at maturity and forms a small circular stoma ; mass of 

 spores yellowish brown ; threads of capillitium hyaline, thick- 

 walled, aseptate, equal, very long, branched, axis lunate, 5 fi in di- 

 ameter : spores glabrous, globose, pale yellow brown, minutely 

 warted, 5-6// in diameter. 



"On the ground. Rio Grande, North* Mexico (Wright). 

 Type in Herb. Berk. 



" Distinguished from Tulostoma Meyenianum in the entire mouth 

 and the hollow, even and not striated stem." 

 Tylostoma sp. (Described by Morgan, Jour. Cin. Soc. Nat. 



Hist. 12 : 163. //. 16. f. 5, as T. Meyenianum KX, but it is 



clearly distinct from that species, though it might possibly be 



referred to T. obesnm C. & E.) 



" Peridium depressed, globose ; the cortex soon receding, leav- 

 ing a smooth whitish or yellowish surface to the submembrana- 

 ceous inner peridium, the apex plane with a lacerate mouth : 

 stipe long, thick, unequal, fusiform or tapering, nearly solid, sul- 

 cate: threads of the capillitium long, much thicker than the 

 spores, branched, hyaline : spores subglobose, even, pale brown, 

 4-5-5-5 mic in diameter. 



" Growing in sandy soil. New Mexico, Wright; Colorado, 



Webber 



Plant 2-4 inches in height, the peridium %-i inch in 

 diameter, the stipe about % of an inch in thickness at the thickest 

 part. Specimens referred to T. Angolense W. & C. do not differ 

 otherwise than in having the stipe thickest at the apex and taper- 



Probably a misprint for New 

 the Rio Grande. 



