BARTRAMIA. 287 



The dense tufts or cushions, slender rigid stems and small, closely imbricated 

 leaves arranged in five rows which usually give a distinctly angular outline to the 

 stems, render this species easy of recognition even without the fruit, which is less 

 regularly globose than in most species of the Order, and with a very distinct form of 

 peristome. 



The time of fruiting is usually given as late summer (July, August), but all the 

 plants I have seen or have gathered at this time have the capsules long past maturity, 

 and usually show the next year's fruit just appearing. 



69. BARTRAMIA Hedw. 



Stems often robust, branching dichotomous, not whorled. 

 Leaves long and narrow, usually papillose ; cells very small, 

 rectangular. Capsule (in the European species) sub-globose, 

 deeply striate ; peristome rarely absent or simple, usually double, 

 inner rarely with cilia. Synoicous, or autoicous, with the male 

 flower gemmiform in all the British species. 



The British species, at least, of this genus are easily known 

 by their much longer and narrower leaves than are found in the 

 plants of the rest of the Order. There is little variation in the 

 form of the capsule, and the specific characters are for the most 

 part drawn from the vegetative organs. 



{Leaves smooth, recurved towards apex ; plant slender 1. CEderi 

 Leaves papillose, patent or spreading 2 



/Ls. with wide, white, sheathing base ; cells long and narrow .j. ithyphylla 



\Ls. scarcely sheathing ; cells scarcely elongate 3 



/Capsule erect, symmetric ; leaves erecto-patent 2. stricta 



3\Capsule oblique ; leaves spreading 4 



I Seta erect ; capsule exserted ; leaves often glaucous green 4. pomiformis 



4< Seta curved, very short ; capsule more or less hidden among the long, linear- 

 ly setaceous leaves .5. Halkriana 



1. Bartramia CEderi Sw. (Bryum CEderi Gunn.) 

 (Tab. XL. C). 



Densely tufted, tomentose below, deep green, 2-4 inches high, 

 more slender than B. pomiformis , branching dichotomous or t>ub- 

 fastigiate. Stems angular, usually triangular in section. Leaves 

 shorter and less crowded than in that species, about iy 2 lines long, 

 spreading and recurved, when dry somewhat rigidly twisted and 

 divaricate, rather glossy ; linear-lanceolate from an indistinct, 

 not sheathing base, shortly pointed ; margin widely revolute for 

 most of its length, towards apex sharply serrate ; nerve narrow, 

 reaching apex or shortly excurrent, denticulate at back above ; 

 areolation smooth, upper minute, shortly rectangular and sub- 

 quadrate, resembling that of B. pomiformis, but slightly larger 

 and more angular, at base more elongated and pellucid, reddish 



