— 5 — 



2. Capsule fully exserted, i6-striate anomalum. 



Capsule emersed or emergent, 8-striate 3. 



3. Capsule ovate-cylindric, urn half emergent when dry. . .Porteri. 

 Capsule much shorter, ovate-globose, leaves nearly reaching 



mouth of urn when dry Lescurii. 



4. Stomata superficial (/. e., with both guard cells on the surface. 



See Plate VI, Figure 13) 5- 



Stomata immersed. (See Figure I, 10) 8. 



5. Leaves obtuse (rarely with some leaves acute), broad 



pointed, margins plane obtusifolium. 



Leaves acute, margins revolute or involute 6. 



6. Capsule almost or quite exserted, smooth, or very slightly 



plicate around the mouth when dry and empty. . . .speciosum. 

 Capsules immersed or slightly emergent, plicate the whole 



length when dry 7- 



7. Empty capsule strongly contracted below the mouth when 



dry, neck immersed; common sordidum. 



Empty capsule less strongly contracted, exserted; rare affine, 



8. Capsules strongly contracted under the mouth when dry, 



and so strongly plicate that the red-brown folds are in 

 contact on the outside when dry and empty, ..strangulatum. 

 Capsules very slightly or not at all contracted, much less 

 strongly plicate, pale, whitish or yellowish 9. 



9. Leaves entire, blunt at extreme apex Ohioense. 



Leaves (some at least) dentate, with projecting cells, often 



apiculate , 10. 



10. Leaves mostly acute at apex, not rounded ; usually some with 



an apiculus of a single projecting cell, capsules plainly 8 



plicate when dry. Schiinperi. 



Leaves obtuse, rounded at apex and some sharply dentic- 

 ulated at apex with several projecting cells, capsule 



smooth or faintly 8 plicate when dry pusillum. 



O. ANOMALUM Hedw. Plate II. In rather dense cushions, dark olive green 

 or brown below; leaves ovate-lanceolate, papillose with small simple papil- 

 lae ; calyptra hairy ; capsule usually fully exserted, i6-striate, the 8 inter- 

 mediate folds less distinct, oval-cylindric when moist, cylindric when dry, 

 abruptly narrowed to the neck: peristome erect when dry, of 16 teeth, 

 usually separate, with preperistome (/. with two short lamellae before 

 each tooth reaching as high as the second or third articulation) ; segments 

 none or rudimentary. Spores maturing May-June. Not rare. 



Mrs. Brittonsays that we also have the var. saxatile., which has narrower 

 8-striate capsules with teeth united in pairs, and 8 well developed segments. 



This species will not be confused with any other species of Ortho- 

 trichu?n, but may be confused with Weissia Americana. The latter has the 

 dry capsule gradually narrowed into the long neck and the teeth rejlexed 

 when dry ; besides it is almost black in color except at the extreme ends of 



