White: Tylostomaceae of North America 433 



tate, swollen at joints : spores subglobose, nearly smooth or with 

 occasional tuber-like warts, thick-walled, 3-5 // in diameter. (PI. 



33, f- 7-9-) 



British Columbia: JSIacoun (type); Colorado: Fort Collins, 



Baker, 405. 



12. Tylostoma fibrillosum sp. nov. 



Peridium globose, 1-2 cm. high, 1-2.5 cm. in diameter : outer 

 peridium retreating leaving a smooth whitish surface to the thin, 

 membranaceous inner peridium, and leaving a thick portion round 

 the base of the peridium forming a ring : collar indistinct, close : 

 mouth raised, fimbriate, roundish : stem equal or slightly tapering 

 toward the base, sulcate, firm, white and slimy within and without, 

 somewhat hollow, fibrillose stuffed, and having a small thickened 

 bulb which in some specimens falls off leaving a flat, whitish sur- 

 face to the base of the stem, 5-7 cm. long, 5 mm. in diameter : 

 capillitium whitish, hyaline, 4-8 // wide, branched, some threads 

 rather thicked walled, sparingly septate, not much swollen at the 

 joinits, rather flattened : spores subglobose, minutely warted, 

 darker than the capillitium, some short pediceled, 3-5 fx in dia- 

 meter. (PI. 33, f. 4-6.) 



Ontario : Dcarncss (type) ; Michigan, Hicks. Growing on sand 

 dunes. 



The stem is much covered usually for upwards of 2 cm. with 

 the mycelial strands, and adhering sand. The specimens from 

 Michigan have rather more swollen septa. 



13. Tylostoma subfuscum sp. nov. 



Peridium globose, 0.8-1.3 cm. high, 1-1.5 cm. in diameter: 

 outer peridium scaly, retreating, leaving a ring around the base of 

 the smooth, brownish inner peridium : mouth raised, fimbriate : 

 collar inconspicuous, close : stem brown, somewhat lacerate scaly, 

 leathery, sulcate, with a small thickened bulb at the base, 2-3 

 cm. long, 3-5 mm. in diameter ; capillitium lightish yellow, hya- 

 line, branched, threads long and slender, 4-6// wide, free ends 

 rounded, occasionally septate, somewhat swollen at the joints : 

 spores subglobose, minutely warted, some short pediceled, 3-5 // 

 in diameter. (PI. 34, f. 10-12.) 



Colorado, Bethel, 21. 



14. Tylostoma fimbriatum Fries, Syst. Myc. 3 : 43. 1829 



Peridium subglobose, 1-1.5 cm. high, 1-1.5 cm. in diameter: 

 outer peridium retreating, having a smooth, brownish surface to 



