76 BRITISH HEPATIC^. 



marginal ones sub-quadrate, iVee" ^ diameter ; middle cells poly- 

 gonal, -g^" each way ; those near the base of the leaf 4^" by stt"' 

 Epidermis smooth. Contents uniformly granular ; trigones incon- 

 spicuous. The cilia are composed of four to six cells, the terminal 

 one acute, and those at the base double. 



Inflorescence generally on distinct shoots (dioicous), rarely au- 

 toicous (Hook. Jung. t. xxi. f. 3). 



Invoiucral bracts (f. 15, 2) two, differing from the ordinary leaves 

 only in size. 



Colesule (f. 15, 3) conspicuous, \" to ^"in length, by a line broad, 

 obovate from a contracted ventricose base, from which it becomes 

 thinner and broader to the truncate densely ciliate apex. At an 

 early stage both the margins and summit are recurved (the 

 latter remarkably so), but as the capsule matures, the colesule 

 becomes more tubulose and erect. Colour paler than the leaves, 

 ochraceous ; cells oblong-polygonal. Like other species producing 

 innovations, the colesule frequently appears lateral, or central 

 between dichotomous sho9ts. 



Calyptra pyriform, white, delicately reticulate, tipped with a 

 short style, and bearing at the base a few fusiform pistiUidia. 



Capsule large (xf"), roundish-ovate, reddish-brown (f. 15, 2) ; 

 valves four, elliptic-ovate, coriaceous. On section the walls of the 

 capsule are found to be composed of five layers of cells, the outer 

 thin and tabular, the two following ones thickened and crossed by 

 brownish bands, and the two inner rows of looser texture and not 

 incrassate. JPedicel short, succulent. 



Spores minute, round, cinnamon-coloured, ^ ^\ „" in diameter. 



Maters bispiral, filiform, too " by 55^00" - 



Androecium terminal, sub-spicate, or interrupted. 



Perigonial bracts smaller and more closely imbricated, saccate 

 at the base ; lobes united for more than half their length, nearly 

 equal ; margins recurved, 



Antheridia (f. 15, 5) axillary (3-6), ovoid or spherical, olive- 

 green ; pedicel slender, transversely striate, about as long as the 

 anther. 



Intermingled with the antheridia we find, as noted by Mooker, 

 a few " pointed, simple, or slightly-branched filaments," resembling 

 the pa/raphyses of mosses, but apparently peculiar to ;S'. nemorosa. 



GemmcB are frequently present on barren individuals, forming 

 dark-brown or black warty masses at the apices of the growing 

 stems and terminal leaves. Under the microscope they appear to 

 be composed of particles of a clavate or elliptic form, either unicel- 

 lular or 2-3-septate, and of a yellowish-brown colour. 



Obs. — I have felt some hesitation whether /3 pwi-purascens (Hook. 1. c. t. xxi. 

 f. 16) should be described as a variety of <S^. nemorosa. But, upon the whole, I incline to 

 the opinion oiBr. Gottsche, that it is more nearly allied with S. undulata. '' I cannot " 



