Venturi and Mrs. Britton consider them distinct, and Mrs. Britton says that 

 we have no capulatum in the Eastern States. These two forms have not 

 been frequently collected or adequately described. Their habitat and im- 

 mersed or emergent capsules should serve to identify them and collectors 

 should be on the lookout for them. 



Dr. Venturi stated in a letter to Mrs. Britton that O. Porteri had a dis- 

 tinct preperistome as in 0. anomalum, but he is the only one who has noted 

 it, and other observers have failed in their attempts to verify his observa- 

 tions. 



Ftg. I. — O. Ohioense (Icones Muse. Suppl PI. 48). 



Fig. 7— Dry and empty capsule. Fig. 10— Stoma. Fig. 5— Areolation 

 of leaf. 



O. Ohioense S. & L. Figure I. In rather dense, small cushions, yel- 

 lowish green, brown below; stems about i cm long; leaves oblong-lanceo- 

 late, blunt at the apex or obtusely acute, papillose; calyptra hairy; moist 

 capsule immersed, oblong-ovate, when dry slightly 8-plicate, campanulate, 

 becoming more narrowed with age, straw colored; peristome of 8 double 

 teeth, strongly reflexed when dry ; segments shorter than the teeth, of a 

 double row of cells, except at apex: spores maturing in early spring (April) 

 Common on trees. When sterile it is a difficult matter to distinguish this 

 from the next, but the straw-colored lightly-plicate capsules are eas}?- of 

 recognition and the entire leaves serve to distinguish it from the other 

 species with light-colored capsules. 



O. STRANGULATUM Sulliv. Figure II. This is one of our commonest 

 mosses, abundant on shade trees almost everywhere. It can be recognized 

 with a hand lens by the characters given in the key if one is familiar with it. 

 The capsules are not so deeply plicate until a month or more after the spores 

 ripen. It is a little smaller than the preceding, the le aves are narrower, 

 and the calyptra naked; the spores apparently mature about a month 



