428 White: Tvlostomaceae of North America 



Stem not tapering ; peridium globose. 



Capillitium freely septate ; stem short (1-1.5 cm.), collar close. 



5. T. tninutum. 



Capillitium rarely or never septate ; stem longer ( 1-5—5 cm - )> collar 



distant. 

 Mouth raised, convex. 



6. T. Kansense. 



Capillitium freely septate ; outer peridium long persistent. 



7. T. poculatum. \/ 



Capillitium rarely or never septate ; outer peridium soon receding. 



8. T. obesum. ^ 



Spores verrucose or granular. 



Mouth plane. 9- T. campestre. 



Mouth raised, convex. 



Spores furnished with long blunt spinules ; stem short (0.75 cm.), rough 

 spiny. 10. T. exasperatwn. C 



Spores with coarse scattered tubercles ; stem longer (3 cm. ), even, nearly 

 smooth . 11. T. tuberculatum . r 



Spores finely granulate-verrucose. 



Capillitium sparingly septate, not much swollen at the joints. 



Stem elongate (6 cm.), with copious persistent mycelial strands. 



12. T. fibril losttm. 



Stem shorter (3.5 cm.), without mycelial strands. 



13. T. stibfuscum. ^ 



Capillitium freely septate, swollen at the joints. 



Peridium smooth ; mouth fimbriate. 14. T. fimbriatwn. 



Peridium pitted ; mouth lacerate. 15. T. punctatum.L 



i. Tylostoma albicans sp. nov. 



Peridium depressed globose, 0.7-1 cm. high, 1—1*5 cm. in 

 diameter : outer peridium scaly, retreating and leaving a smooth 

 whitish surface to the inner membranaceous peridium : mouth short 

 tubular, entire, prominent : collar irregular, 3-5 mm. distant from 

 the stem : stem equal, slightly thickened at the base, the outer coat- 

 ing lacerate scaly, whitish like the peridium, 4-6 cm. long, 0.5 cm. 

 in diameter : capillitium whitish, hyaline, branched, septate, slightly 

 swollen at the joints, 4-6 fi wide, free ends rounded : spores reddish 

 brown, irregularly globose, pedicled, smooth, or if rough only a- 

 very few of them so, 4-5 fi in diameter. (PI. 3 1, f. 4-7.) 



Texas : E. D. Cope. 



2. Tylostoma peduxculatum (L.) Schroeter ; Cohn, Beitr. Biol. 



Pflan. 2 : 65. 1877 



Ly coper don pediinciilatum L. Sp. PL 11 84. 1 753. 



Tidostoma brumale Pers. Romer Neues Mae. Bot. I : 86. 



1794. 



Tidostoma mammosum Fr. Syst. 3: 42. 1829. 



