TWENTY-8EVENTH ANNUAL MEETING. 173 



PTYCHOMITRIUM, p. 156. 



Plants small (1 cm.): leaves acuminate, nearly or quite entire. 

 Collum 0. 



Teeth subulate (1:10): entire P. incurvum Sulliv, 2 



Collum equaling one-third sporangium P. pygmaeum Lesq. & James i 



P. incurvum, and P. pygmaeum, Southeast Kansas (Smyth's Check List). 



ORTHOTRICHUM, p. KM. 



A. Stomata superficial. 



Peristome double; capsule strongly costate. 

 Leaves not gemmiferous: teeth with punctulate areoles: cap- 

 sule including collvim subcylindric. 



Leaves apiculate, minutely papillose O. brachytrichum Schimp. 18 



Capsule ribbed only near the mouth: peristome opaque, very 



papillose, reflexed when dry O. speciosum Nees 12 



B. Stomata immersed. 



Peristome simple; capsule faintly costate, bands (8, rarely 16) 



cinnamon red O. anomalum Hedw. 1 



Capsule 16-costate, bands (16, rarely 8) yellow * O. cupulatum Hoffm. 3 



Plants shorter, blackish; capsule shorter, urceolate 



.' .'...* O. cupulatum, var. minus Sulliv. 



Peristome double; capsule costate when dry, half immersed, 

 obovate, contracted below mouth. 



Leaves simple, often slightly papillose: neck not cupped 



X O. strangulatum Beauv. 19 



O. brachytrichum, O. speciosum, O. anomalum (Smyth's Check List); 

 * O. cupulatum, and * O. cupulatum, var. minus, Riley (M. 

 Reed), x O. strangulatum. Saline (Henry). 



PYRAMIDULA, p. 196. 



Calyptra large, inclosing capsule, dehiscent by a lateral cleft : 



orifice naked x P. tetragona Brid. 



Saline ( Henry). 



PHYSCOMITRIUM, p. 196. 

 Capsule exserted. 

 Leaves entire or nearly so. 



Seta short, little exceeding leaves * P. Hookeri Hampe 4 



Seta much longer (5-10 mm.) 



Leaves linear-lanceolate ; collum x P. turbinatum Mich. 6 



Leaves ovate-lanceolate ; collum distinct * P. acuminatum B. & S. 5 



Leaves serrate ; cells at mouth of capsule transversely elon- 

 gated, 5-7 rows; leaves acute, not bordered, P. pyriforme Linn. 2 

 Costa excurrent ; seta short ; annulus small, simple, falling 



in pieces * P. Kellermani Mrs. Britton 



* P. Hookeri, Riley (Kellerman & M. Reed): Wyandotte and Pottawatomie 

 (M. Reed); Franklin (Meeker); x P. turbinatum? sterile. Saline (Henry); P. 

 pyriforme, Shawnee (Cragin); Brown (Becker); Labette (Newlon). * P. Kel- 

 lermani, Riley ( Kellerman ); Wyandotte and Pottawatomie ( M. Reed ). * Phys- 

 comitrium Kellermani, Mrs. Britton, n. sp. Plants 3-5 mm. high ; stem short, 

 simple or with basal innovations ; leaves few, rosulate, 3 mm. long, ovate tri- 

 angular acuminate, vein excurrent ; margins coarsely serrate, cells very lax, basal 

 scarcely elongated ; inflorescence monoecious ; seta short, 1-2 mm. long, scarcely 



