MUSCI. (mosses.) 619 



Tribe IV. DICRANE^E. 



10. ARC TO A, Br. & Sch. (Tab. 15.) 



Calyptra cuculliform, inflated. Operculum large, obliquely rostrate. Cap- 

 sule oval or somewhat turbinate, ribbed when dry, erect or inclined, annulate, 

 exserted. Peristome single : teeth 16, lanceolate-subulate, cloven half-way, 

 the divisions unequal. Inflorescence monoecious: male flower gemmiform.— 

 Densely casspitosc alpine species, growing on rocks, with long lanceolate-seta- 

 ceous falcate-secund costate leaves, of an oblong and compact areolation. (Name 

 from apKTos, north; found only in Northern latitudes.) 



1. A. fulvclla, Br. & Sch. Leaves fulvous, with a strong continuous 

 costa denticulate at the apex ; perichretial leaves large, sheathing, overtopping 

 the capsule. — White Mountains, New Hampshire, Oakes. (Tab. 15.) (Eu.) 



II. CAMPYLiOPUS, Brid. (Tab. 15.) 



Calyptra cuculliform, fringed at the base. Operculum conic-rostrate. Cap- 

 sule oval, regular or gibbous, annulate, ribbed when dry, on a decurved pedicel. 

 Peristome single : teeth 16, linear-lanceolate, deeply bifid; segments unequal. 

 Inflorescence dioecious : male flower terminal. — Stems densely casspitosc, dichot- 

 omously branched ; leaves rigid, lanceolate-setaceous, with a broad excurrent 

 costa ; areolation large, oblong or rhomboid at the base, elsewhere much smaller 

 and subquadrate. (Named from KafnrvXos, curved, and ttovs, a foot, in allusion 

 to the curved pedicel.) (Tab. 15.) 



1. C flexildSMS, Brid. Stems l'-2' high, radiculose; leaves erect-patent 

 or falcate-secund ; capsules aggregated at the apex of the stem, regular or gib- 

 bous. — Shaded rocks, Grandfather Mountain, N. Carolina. (Tab. 15.) (Eu.) 



2. C. leucotrichus, Sulliv. & Lesqx. (Muse. Bor.-Amer., No. 73.) 

 Stems densely leaved above, claviform ; leaves erect-patent, linear-lanceolate, 

 with a long hyaline and denticulate hair-point; costa very broad, strongly lamel- 

 lose on the back. — On rocks, dry woods, Raccoon Mts., Alabama, Lesquereux. 



3. C L-eiYilUS, Sulliv. Stems fastigiately branched ; the branches termi- 

 nated by dense heads of miuute oblong bodies (probably abortive leaves) ; leaves 

 lanceolate-subulate, erect, rather secund, the costa occupying nearly all the leaf. 

 — Ohio and Pennsylvania : not rare; on very much decayed stumps and logs. 

 Resembles the young growtli of Dicranum flagellare. 



12. DICBANODONTIUM, Br. & Sch. (Tab. 15.) 



Calyptra cuculliform, not fringed at the base. Operculum conic-subulate. 

 Capsule elliptic-oblong, annulate, smooth, pendulous from an arcuate pedicel. 

 Peristome single : teeth 16, linear-lanceolate, cloven to the base; their divisions 

 unequal. Inflorescence dioecious: male flower gemmiform, terminal, — Habit 

 and aspect nearly as in the last genus. (Name from biicpavos , fo-ked, and 

 obav, a tooth.) 



