— 9 — 



O. ScHiMPERi Hamm. (O. fallax Schimp ) Plate III. In short, close, 

 dark green tufts, only a few mm. high ; leaves oblong-lanceolate, obtuse or 

 usually some acute and ending in an apiculus of a single elongated cell, 

 leaf cells rather large and thinner- walled than usual in the genus, papillose; 

 calyptra with a few short hairs; capsule small, immersed oblong-ovoid, 

 light colored, when dry narrow and slightly contracted below the mouth, 

 with 8 rather prominent plicae; teeth 8, reflexed, densely papillose; segments 

 8; spores maturing in spring, Frequent. 



A specimen with all the leaves obtuse might be mistaken for O. Ohioense, 

 but the smaller size and darker color and smoother calyptra are quite pro- 

 nounced. The form with the leaves, narrowly acute and apiculate and nar- 

 rower capsule has been called var. truticatulum by Austin. Rarely the 

 leaves have more than a single projecting cell at the apex. Mrs. Britton and 

 Dr. Best think that O. brachytrichum Schimp. is a synonym for the American 

 form of this species, and that we have no true O. Schiiiiperi. 



Fig. III. 



Leaf structure of 

 O. piisilluju 

 (Icon. Muse. Suppl. 

 PI. 5o). 



O. PUsiLLUM Mitt. {O. psilocarpiim 

 James.) Figure III. The plants are as 

 small as those of the preceding and the 

 color is blackish green, but the capsules 

 are ovoid or globose when moist, only 

 faintly ribbed even when old. Spores mat- 

 uring in May. Apparently not common. 

 The apex of the leaves is very character- 

 istic as figured. It is very like O. Schim- 

 peri except in the characters mentioned 

 here and in the key. 



O. OBTUSiFOLiUM Schrad. Plate IV. 

 Yellowish-green, about an inch high ; leaves 

 short and very broad, oblong-ovate, very 

 broad and obtuse at apex, papillose, mar- 

 gin not appreciably revolute or incurved: 

 calyptra naked; capsule immersed, with 8 

 plicae when dry; peristome double. 



Probably a very common species, but 

 so seldom fruiting as to be collected infre- 

 quently. The leaves usually bear clavate, 



