MUSCI. (MOSSES.) 649 



when dry furrowed, with a long and erect (rarely short and arcuate) pedicel. 

 Peristome usually double, sometimes single or none ; the exterior of 16 teeth 

 like those of Biyum ; the interior a plicated membrane divided half-way into 16 

 cilia, splitting along their middle ; their segments divergent ; rudimentary ciliolae 

 often present. Inflorescence various. Plants remarkable for their globose 

 capsule ; growing in extensive tufts on the ground, and on rocks, rarely on 

 trees ; stems covered with a dense radicular tomentum ; leaves lanceolate, more 

 or less elongated, serrate, papillose on both surfaces, of a firm texture ; areolae 

 dense, quadrate or oblong ; costa percurrent or excurrent. (Named in honor of 

 John Bartram, the earliest native American botanist.) In the following species 

 the capsule is cernuous : peristome double : pedicel long and erect. 



1. BARTRAMIA PROPER. Stems dickotomously branched. 



1. B. ithyphylla, Brid. Hermaphrodite; tufts compact, bright yellow- 

 ish-green ; stems ^' - 2' high ; leaves erect-patent, lanceolate, subulate from a 

 broad, sheathing, whitish base ; costa large, excurrent, with a scabrous point 

 Alpine and subalpine rocks, White Mountains, New Hampshire. (Eu.) 



2. B. <Ederi, Swartz. Hermaphrodite ; tufts loose, extensive, dark-green ; 

 stems slender, l'-3' high; leaves remote, patent-recurved from an erect (not 

 sheathing) base, lanceolate, carinate, scarcely papillose, recurved on the margins, 

 costate to the apex. Mountains of New England. (Eu.) 



3. B. pomiformis, Hedw. Monoecious; tufts large, rather dense, 

 glaucous-green; stems l'-3' high; leaves crowded, spreading, lanceolate-subu- 

 late or linear-subulate, crisped when dry, flattish, the costa excurrent; male 

 flower gemmiform, contiguous to the female. Shady banks, either dry or 

 moist: common. (Tab. 17.) (Eu.) 



2. PHILONOTIS, Brid. Stems fasciculately branched. 



4. B. fontana, Brid. Dioecious; tufts extensive, dense, yellowish or 

 glaucous-green; stems elongated (3' -7' high); branches interruptedly verticil- 

 late ; leaves of two forms, either short, ovate-acuminate and appressed, or longer, 

 lanceolate and spreading or secund, both reflexed on the margins below and ob- 

 scurely plicate at the base ; inner leaves of the discoid male flower obtuse, not 

 costate. Wet springy places, in mountain districts. (Eu.) 



5. B. calcfirea, Br. & Sch. Dioecious; compared with the last species 

 (which it very closely resembles), its leaves are longer, more rigid and gradually 

 tapering, less papillose, with a larger areolation and a stronger costa ; perigo- 

 nial leaves costate to the acuminated apex ; teeth of the peristome not so closely 

 articulated. Specimens intermediate between this species (as above described 

 from European specimens) and No. 4, were gathered by Lesquereux, on wet 

 rocks, in the mountains of North Carolina. (Eu.) 



6. B. Ulurcllica, Brid. Dioecious; resembles reduced forms of B. fon- 

 tana ; leaves uniform in shape, spreading or secund, narrow, lanceolate, not pli- 

 cate, mucronate by the excurrent costa ; capsule thin-walled ; male flower gem- 

 miform ; perigonial leaves erect, lanceolate, acute, costate. (B. Muhlenbergii, 

 Schwcegr \ Gravelly and springy places. (Eu.) 



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