SCAPANIA. 225 



subrotund, trapezoid, rotundate, epidermis smooth ; celJs smallish, 

 5-6-sided, walls firm. Bracts with lobes subequal. Perianth 

 obloDg-obovate, mouth entire or denticulate. 



Male stems somewhat similar to the others ; androecia middle 

 or near the apex ; perigonial bracts rather smaller and more 

 closely imbricate, lobes subequal ; antheridia several in each bract, 

 roundish-oval, pedicel long. 



Fruits April, May, June. 



Dimensions.— Stems -J inch to 6 inches long, diam. '3 mm. to 

 •4 ram., with leaves 4' mm. wide; leaves, antical lobe 1'5 mm. 

 X 1* mm., postical lobe 2" mm. x I'd mm. ; cells 02 mm., 

 •025 mm. ; perianth 3" mm. x 1"25 mm. 



Hab. — On rocks or stones in or by streams or in wet places ; 

 generally distributed throughout the British Isles ; most abundant 

 in subalpine localities, ascending to the top of our highest 

 mountains. 



1, 3-5, 7-18, I. 



Found on the Continent, Canaries, North America. 



Obs. — This is the most common and variable type of British 

 Scapaiiue ; it varies in height from ^ inch to 5 and (3 inches, and 

 assumes maii}^ forms, which varieties are described at length by 

 Nees in his " Eur. Leber." The notes under species likely to be 

 confounded with it will enable the student to distinguish it. 



Description of Plate LXXXIX. — Fig. 1. Plants natural 

 size. 2, 3. Portion of stems x 16 (Herb. Mougeot). 4. Peri- 

 gonial bract x 24 (Tyn-y-Groes). 5. Portion of leaf x 290 

 (Mougeot & Nest. Exsicc). 6. Perianth x 16 (Balcombe, 

 (jr. Davies). 



11. Scapania purpurascens [Hook.), Ta//I. MSS. 



Jimgermania nemorosa, \ar. 2ntrpurascens, Hook. Biit. Jung. t. 21, f. 1(1 (181t'»). 



Dioicous, csespitose, medium size, rosy to deep purple, rarely 

 greenish in colour. Stems erect or procumbent, rigid, dark brown 

 or purple, simple or with one or two branches proceeding fron) 

 near the base ; radiculose, rootlets few, whitish. Leaves imbricate 



p 



