20 CRYPTOGAMIA. 



late ; costa usually vanishing below the point ; areolation composed of 

 minute subquadrate papillose cellules, those in the lower part of the 

 leaf larger, oblong. Capsule oval-obovate, with a long collum tapering 

 into the pedicel, horizontal-arcuate, subgibbous, striate, longitudinally 

 ribbed when dry : peristome single, very fugacious ; consisting of 8 

 thin hyaline triangular lanceolate distant teeth 5-7-articulated, with 

 a median zigzag line, horizontal and reaching nearly halfway across 

 the mouth. Operculum long-rostrate from a conic base : pedicel short 

 (6-8 lines high) for the height of the plant, barely overtopping the 

 innovations. Dioicous : the male plants intermixed with the fertile ; 

 the flowers terminal, gemmiform ; perigonial leaves broad ovate, very 

 concave, closely embracing the numerous antheridia and long filiform 

 paraphyses. 



There are on record several Zygodontes from the Andes of South 

 America apparently closely allied to the present species, but no. one of 

 them combines the tall stems, the long taper-pointed squarrose leaves, 

 the subpyriform arcuate capsule with a long attenuated collum, the 

 short, rather stout pedicel, and the single 8-dentate peristome of Z. 

 Peruvianus. 



Plate 4, B.— Ztgodon Pekuvianus : one male and three fertile plants, 

 of the natural size. Fig. 1, 2. Female and male plants. 3, 4, 5, 6, 7, 8. 

 Leaves. 9, 10, 11. Cross sections of same. 12, 13. Portions of leaf, 

 showing the reticulation. 14. Cellules. 15. Same, seen in cross sec- 

 tion. 16, 17, 18. Capsules, with opercula. 19. Capsule, without 

 operculum. 20. Peristome, with portion of capsule. 21. Teeth of 

 the peristome. 22, 23. Perigonial leaves. 24. Antheridia, paraphy- 

 ses, and perigonial leaf. 25. Vaginula, with archegonia and para- 

 physes. — Details magnified. 



Tribe 10. ORTHOTRICHE2E. 



1. ORTHOTRICHUM, Hedw. 

 1. Orthotrichum leiocarpum, Br. & Sch. 



Orthotrichum leiocarpum, Bryol. Europ. 3, Orthot. Monogr. p. 28, t. 15. 



