Musci. (mosses.) (19) 619 



Tribe IV. DICElNEiE. 

 10. ARCTOA, Br. &Sch. (Tab. I.) 



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 cisspitose 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. fulvella, Br. & Sch. Leaves fulvous, with a sti-ong contmuous 

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

 the capsule. — White Mountains, New Hampsldre, Oate. (Tab. I.) (Eu.) 



11. CAMPYI.OPUS, Brid. (Tab. I.) 



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 dicEcious : male flower terminal. — Stems densely cisspitose, dichot- 

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

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

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

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



1. C flexuosus, 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 Mountaia, N. Carolina. (Tab. I.) (Eu.) 



2. C. leucotriclios, 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 Iiea.iillS, Sulliv. Stems fastigiately branched ; the branches termi- 

 nated by dense heads of minute 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 growth of Dicranmn flagellare. 



12. DICRANOBOWTIUM, Br. & Sch. (Tab. I.) 



Calyptra cuculliform, not fiinged 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; then- divisions 

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

 and aspect nearly as in the last genus. (Name from bUpavos, forked, and 

 68d>v, a tooth.) 



