230 HEPATIC^. 



of the margin of leaf x 85. 9. Portion of leaf x 290. 10. 

 Bract X 16. 11. Perianth and bract x 11. 12. Perigonial 

 bract, explanate x 24 (Littlebeck, Eskdale, M. B. Slater). 



13. Scapania irrigua [Nees), Dirin. 



Jungermania irrigua, Nees, Nat. Eur. Leb. 1, p. 193 (1833). 

 Scapania irrigua, Dum. Recueil, p. 15 (1835). 



Dioicous ; in spreading tufts or creeping loosely amongst 

 Sphagna, medium size, of a pale green or brownish colour. Stems 

 ascending or prostrate, lax, rooting up to the apex, simple or 

 slightly branched. Leaves horizontally inserted, distant or 

 approximate, lax, divided unequally to about the middle into two 

 lobes, entire, or the upper leaves sometimes distantly denticulate ; 

 antical lobe about half the size of the postical, convex, subquadrate 

 or sub-rotund, acute or sub-mucronate ; postical lobe subquadrate 

 to sub-rotund, acute or sub-mucronate ; texture delicate, cells 

 smiallish to moderate in size, roundish, angles slightly thickened. 

 Perianth obovate to oval, mouth dentate. Perigonial stems with 

 bracts subimbricate, ventricose at the base ; antheridia numerous, 

 sometimes 4 in each bract. 



The plant is sometimes gemmiparous ; gemmse small, greenish, 

 at the margin of the upper leaves. 



Fruits April, May. 



Dimensions. — Stems from ^ to 1 inch long, -3 mm. diam., with 

 leaves 2" mm. to 3" mm. broad; leaves, antical lobe 1* mm. x 

 1*2 mm., '7 mm. x 1" mm., '6 mm. x "8 mm. ; postical lobe 1'4 mm. 

 X 1*8 mm., r mm. x 1*3 mm. ; cells '025 mm. x '03 mm., -025 mm. 

 X '025 mm. ; perianth 2" ram. long x 1-3 mm. broad, 1'6 mm. 

 X '9 mm. 



Hab. — Growing in swampy places or on wet banks. Some- 

 what rare. 



1. Marazion Marsh; Trungle Moor; Chyanhal ; Tremethick 

 Moor, West Cornwall, W. Curnow (as Scapania ulir/hwsa, Trans. 

 Penz. N. H. Soc. 1881-82). 2. New Forest, C. Li/ell. Guestling 

 near Hastings, Rev. E. N. Bloonipcld. 5. Shirley Heath, 



