430 White : Tylostomaceae of North America 



4. Tylostoma gracile sp. nov. 



Peridium depressed globose, 1-1.5 cm. high, 1.5— 2cm. in di- 

 ameter : outer peridium retreating, leaving but slight traces on the 

 inner peridium which is thin, smooth, whitish and rather shiny : 

 mouth plane, lacerate : collar entire, restricted around the top of 

 the stem : stem slender, 3-5.5 cm. long, 6 mm. in diameter at the 

 top, 3 mm. in diameter at the base which is slightly enlarged, 

 somewhat sulcate, lacerate, whitish within and without, fibrillose 

 stuffed, becoming hollow : capillitium dark ferrugenous, 4-6 [/. 

 wide, ends rounded, and having swollen places mostly near the 

 ends, branched, rather thick-walled, many threads flattened, septa 

 very scarce : spores subglobose, 3-5 jjl in diameter, smooth, short 

 pediceled. (PI. 32, f 1-3.) 



New Mexico : Las Cruces, ]Vootou. 



5. Tylostoma minutum sp. nov. 



Peridium globose, 0.7-1 cm. high, 0.7-1.2 cm. in diameter; 

 outer peridium scaly, retreating, leaving smooth, brownish surface 

 to the thin inner peridium, remnants of the outer peridium forming 

 a cup around the base of the inner peridium : mouth plane, fimbri- 

 ate, small ; collar entire, indistinct : stem 1.5—2 cm. long, 3 mm. in 

 - diameter at the top, 5 mm. in diameter at the base, slender, 

 slightly enlarged at the base, hollow, fibrillose stuffed : capillitium 

 yellowish, hyaline, sparingly branched, rather thin walled, ends 

 rounded, septa swollen at the joints, 3-5 n wide : spores irregularly 

 globose, nearly smooth, pediceled, thick-v/alled, 3-5 jj. in diameter. 

 (Pi. 31, f 11-13.) 



Colorado, Bethel (type) ; Kansas, Kellcrnian. 



6. Tylostoma Kansense Peck, sp. nov. 



Peridium subglobose, 1-2 cm. broad, 1-1.5 cm. high, thick, 

 firm, glabrous, white, somewhat flattened at the base : mouth 

 slightly lacerate on the margin, plane, sometimes slightly promi- 

 nent : collar wide, membranaceous, 2.5 mm. distant from the stem : 

 stem equal or slightly narrowed toward the base, 1.5—7 c"^- lo"S> 

 6—8 mm. thick, hollow or stuffed with silky fibrils, somewhat 

 sulcate-striate, white within and without, slightly and abruptly 

 bulbous: capillitium sparingly branched, colored, 7— ii jJ- wide, 

 hyaline, septa not seen : spores subglobose, 4—5 ii in diameter, 

 brownish ferruginous. (PI. 32, f 7-9-) 



KANS.A.S, BartJiolomeio. July. It has rarely two ostiola. 



