144 DIPLOPERISTOMI. IBartramia. 



red, and rough with tubercles, arise from this small bulb, or 

 perichaetium, which strikes immediately into the earth its brown 

 entangled roots. Upon the summit of the fruitstalk, between 

 it and the capsule, is a short cylindrical apophysis, much nar- 

 rower than the capsule and somewhat wider than the fruitstalk. 

 Capsule large, ovate, oblique, flattish above, below convex, at 

 the base gibbous ; the mouth has an elevated rim or margin , 

 which is irregularly cleft. The whole is of a greenish colour, 

 varied with brown, and almost a deep red brown when quite 

 ripe; lid obtusely conical; calyptra of the same shape, but 

 more acuminated. 



XXXI. BARTRAMIA. 



GEN. CHAR. Fruitstalks terminal ; Capsule subglobose ; Pe- 

 ristome double; the exterior of 16 teeth; the inner of a 

 membrane divided into 16 bifid segments ; Calyptra 

 dimidiate. (TAB. III.) 



Between the division of the segments of the inner peristome, 

 short filiform processes may be observed in all the species of this 

 genus, except B. arcuata. Bartramia approaches very nearly to 

 Bryum, but has, in almost every case, a spherical capsule ; and 

 the 16 broad segments of the inner peristome, instead of being 

 entire, or only perforated, are cleft like the teeth of a Dicranum. 



* Fruitstalks long, straight, (not curved.) 



1. B. pomiformis; leaves patent subulate strongly serrated the 

 nerve reaching to the summit, twisted when dry. (TAB. 

 XXIII.) 



a. minor ; stems shorter ; leaves flexuose. 



Bartramia pomiformis. Hedw. Sp. Muse. p. 164. Smith, Fl. Brit. 

 p. 1340. Engl Bot. t. 998. Turn. Muse. Hib. p. 108. Hook, in Fl. 

 Zone?, ed. 2. (with a figure.) Schwaegr. Suppl v. 1. P. II. p. 145. t. 58. 

 Funck, Deutschl. Moose, t. 24. / 1. Hook. Fl. Scot. P. II. p. 139. 

 Hobson, Brit. Mosses, v. 1. n. 60. Drummond, Muse. Scot. v. 1. n. 65. 

 Brid. Meth. p. 116. Arn. Disp. Muse. p. 40. 



