BRITTON AND HOLLIcK: FOSSIL MOSSES 141 
2-3 mm. long, linear-lanceolate, straight or curved, apparently 
with a thick vein and slender sharp apex: sporophytes terminal : 
seta erect and straight, 1-1.5 cm. long: calyptra mitrate and 
plicate, 2-2.5 mm. long, with well-marked ridges forming darker 
grooves in the light-colored stone. 
The capsules were not yet developed when this specimen was 
buried and nothing but the calyptra remains to indicate the nature 
of the sporophyte, but from general aspect and characters it seems 
to belong nearest to the Grimmiaceae with a resemblance to the 
Piychomitrieae, the calyptra being grooved and long, completely 
enclosing the sporophyte when young, as in Ptychomitrium, and 
prolonged into an acute apex as if the lid were rostrate. 
This species is dedicated to Mrs. Wilmatte Porter Cockerell, in 
recognition of her devotion to science and her invaluable assistance 
in securing specimens from this locality. 
This genus has been known in American bryological works as 
Ptychomitrium, but the older name has_ been reinstated by 
Brotherus in Engler & Prantl, Pflanzenfamilien (1°: 440. 1902) 
while keeping the name of the section, as indicated above. The 
synonymy is as follows: 
Glyphomitrium Brid. Mant. 30. 1819; emend. Mitt. Jour. Linn. 
SOc.. 123.105. 1869. 
Brachysteleum Reichenb. Consp. 34. 1828. 
Ptychomitrium (Bruch) Furnr. Flora 1829, Erg. 2: 19. 1829. 
Notarisia Hampe, Linnaea 11: 379. 1837. 
New York BoTraNnIcaL GARDEN. 
