1. F. trichomitria Hedw. — Pterigynandrum H.; Forsstroe- 

 mia Lindb.; Leptodon Mohr; Sulliv. ic. muse. 



Leaves gen. ovate-oblong, short- acuminate, often faintly stri- 

 ate, einuolate at acumen ; middle cells oblong-lanceolate ; costa 

 indistinct. Capsule oblong or subcylindrie, exserted; lid rostrate; 

 pedicel not or partly exserted. — On trees, r. on rocks. Amer. 

 Can.: Macoun. U. S.: Sullivant, com. C. Mueller; Austin, com. 

 Macoun. 



2. F. immersa Mohr. — Leptodon Mohr; ForsstrcEmia Kindb. 



Differs from the last: Branches shorter; leaves subovate; cap- 

 sule smaller, oval and nearly immersed. — Amer. U. S. r.: Sulli- 

 vant, com. C. Mueller. 



3. F. floridana Lindb. — Leptodon Lindb.; Forsstroemia 

 Kindb. 



Differs from F. trichomitria: »Leaves broader, ovate, abruptly 

 acuminate; cells larger and broader; capsule half as large; pe- 

 dicel longer, not diverging from the stem*: Lindb. — Amer. r. 

 »U. S.»: Lindberg (not seen). 



4. F. ohioensis Lindb. — Leptodon Sull. icon. muse. 

 Leaves broad-ovate, abruptly narrowed to a very short, faintly 



sinuolate acumen, not striate; middle cells oval-oblong; costa 

 thick. Capsule suboval, exserted; lid short-apiculate ; pedicel 

 partly emergent. — Trees. Amer. U. S. r.: Sullivant, com. C. M. 

 B. Leaves (at least the younger ones) denticulate above; 

 cells very chlorophyllose, not pellucid. Capsule red-mouthed; 

 teeth brown or red. 



5. F. nitida Lindb. — Leptodon Sull. 1. c. 



Leaves ovate or broadly ovate-oblong, short-acuminate acute, 

 faintly or not striate; middle cells suboblong, the alar ones often 

 more dilated; costa very short or vanishing near the middle. 

 Capsule suboval or subglobose, immersed or partly emergent; 

 teeth pale brown; lid apiculate. — Trees, r. Amer. Canada: 

 Macoun. 



6. F. Ravenelii Austin. — Cryphsea Aust.; Forsstroemia 

 Kindb. 



»Leaves round-ovate obtuse; areolation uniform; costa reaching 

 above the middle. Capsule oval, immersed; teeth red; lid acute* : 

 Lesq. et Jam. — Amer. »U. S. r.: Raveneb: Lesq. et Jam. 

 4. Cryphaea Mohr. 



A. Leaves entire; costa abbreviate. 



a. Leaves small; the inner perichetial truncate or obtuse. 



1. C. glomerata Br. eur.; Sulliv. icon. muse. 



