82 Wheldon : The North of England Harpidia. 



habit resembling" small forms of var. atlanticum, but with 

 narrower cells and of a more lurid colour. Stems slightly 

 branched, procumbent. Leaves from an oval base, rather 

 suddenly contracted to a moderate recurved, rather fine sub- 

 entire acumen, which is canaliculate below. Basal cells slightly 

 incrassate, sometimes coloured, auricles almost obsolete, of 

 small square cells when present. Nerve reaching base of 

 acumen, but often shorter, and sometimes forked, especially in 

 branch leaves, in which it is sometimes nearly obsolete. Per- 

 haps more closely related to Group Amphibium? 



9. Greygarth Fell, at 1,800 feet (60), Albert Wilson ! ! 

 Pendle Hill (60), Wheldon. 



10. Denton Moor (65), A. Wilson ! Warley, near Halifax (63) 

 (somewhat doubtful), Crossland ! Falcon Clints (66), Wheldon! 



Var. Arnellii Sanio. In deep, soft tufts, green on the 

 surface, brown in the interior. Stems floating, regularly and 

 sometimes closely pinnate. Leaves long, narrowly oblong- 

 lanceolate, with very long- attenuated denticulate points. Nerve 

 very strong - , reaching about three-quarters or more. Upper 

 cells long - and narrow, with thin walls ; basal rectangular, 

 incrassate, angular ones yellowish, with incrassate walls, not 

 dilated ; forming- auricles which are sometimes rounded on the 

 outer margin, but not always. 



This was placed by Sanio in the Group Amphibium, but we 

 follow Mons. Renauld in retaining it here. 



10. Strensall Common (62), Holt. Skipwith Common (61), 

 Ingham ! (teste Dr. Braithwaite). 



Group exannulatum Ren., Muse. Gall. 



(H. jluitans var. exannulatum Ren., Rev. Harpid., 1879. 

 ft exannulatum Sanio, 1883. H. exannulatum Guemb., 1854). 



Dioicous. Yellowish green, often purpurascent, more or less 

 compactly tufted, erect or procumbent, pinnate, with circinato- 

 incurved branches. Leaves crowded, glossy, uncinate, secund, 

 denticulate or subentire, basal margin usually serrate, some- 

 times lightly striate, especially when dry. Nerve strong and 

 wide, reaching nearly to the apex, and sometimes slig'htly ex- 

 current. Cells often wider than in the preceding group, the 

 angular ones dilated, forming- large swollen auricles, which are 

 hyaline, distinct, and sometimes extend to the nerve. (See 

 3> P- 9*0 



Var. pinnatum Boul. Yellowish green or green. Stems of 

 moderate length, erect, rigid, pinnate. Leaves falcate-secund, 



Naturalist, 



