430 White : Tylostomaceae of North America 



4. Tylostoma gracile sp. nov. 



Peridium depressed globose, 1— 1 . 5 cm. high, 1.5-2 cm. 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 \i 

 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 jx in diameter, smooth, short 

 pediceled. (PL 32, f. 1- 



New Mexico : Las Cruces, Wooton. 



5. Tylostoma minutumsp. 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 



mou 



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 fi wide : spores irregularly 

 globose, nearly smooth, pediceled, thick-walled, 3-5 fi in diameter. 

 (PL 31, f. 11-13.) 



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Colorado, Bethel (type) ; Kansas, Keller man. 



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 crn - ^ on ^' 

 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, 7-1 1 p wic * e * 

 hyaline, septa not seen : spores subglobose, 4-5 ft in diameter, 

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



Kansas, Bartholomew. July. It has rarely two ostiola. 



