88 



Wheldon : The North of England Harpidia. 



circinate, secund, sometimes slightly crisped or flexuose, spread- 

 ing- at the points, acumen twisted, oblong or oblong-lanceolate, 

 narrowed more or less rapidly to a linear, sometimes subulate- 

 canaliculate point, not plicate, subentire, truncate at the base, 

 not at all, or very briefly, decurrent. C^lls narrow, vermicular, 

 with thick walls, the basal rounded quadrate in one or two 

 rows, with incrassate walls which are sinuous and sometimes 

 porose, the angular not enlarged. This is composed of the 

 following three segregates : — 



Forma typica Ren. (H. revolvens Swartz). Monoicous, 

 often fertile. In large, soft, rufous-purple and green, or blackish 

 tufts, with a metallic gloss. Stems irregularly divided, with 

 rather few imperfectly pinnate branches. Leaves large, densely 

 crowded, circinate, from an ovate or oblong-lanceolate base, 

 tapering into a very long fine canaliculate acumen, which is 

 recurved usually until it almost reaches the base forming 

 a circle. Base truncate, not excavate nor decurrent. Nerve 

 narrow, but rather strong. Cells long, narrow, and incrassate, 

 vermicular, the suprabasal ones nearly all prosenchymatous. 

 Not distinct or decurrent at the angles. 



8. Carr Meadow (57), Whitehead. Buxton (57), A. Ley. 

 Kinder Scout (57), Holt ! Whitehead ! Staley Brushes (58), 

 Whitehead ! Wybunbury Bog (58), W. Wilson ! 



9. Southport and Ainsdale (59), Wheldon ! ! Pendle Hill 

 (59), Wheldon ! Ireby Fell, Marshaw 7 Fell, and Harris End 

 Fell (60), A. Wilson ! St. Anne's (60), Wheldon ! Udale and 

 Roeburndale (60), ■ Wheldon and A. Wilson ! ! Ireby Fell (60), 

 A. Wilson. Burnley (59), Holt. Haweswater (60), Wheldon ! 

 Borwick Swamp (60), A. Wilson. 



10. Hambleton Hills, near Hawnby (62), Wheldon ! Mickle 

 Fell (65), Wheldon ! Beamsley Beacon (63), West ! Malham 

 Tarn (64) and near Todmorden (63), Nowell ! Ilkley Moor and 

 Beamsley Moor (63), A. Wilson! 



12. Riggindale Ridge, Mardale (69), A. Wilson! Loughrigg- 

 (69), Gore. Helvellyn (69), Clowes. Patterdale (69) (G. H. 

 Bryan) ! Deep Ghyll and Barbondale (69), Stabler. 



Var. Cossoni Ren. [Hyp. Cossoni Schimp.). Dioicous or 

 sterile. Robust, taller, frequently richly coloured, reddish 

 brown. Stems more or less regularly pinnate. Leaves larger, 

 more distant, less reg-ularly circinate, the tip of the acumen 

 generally flexuose, spirally twisted and spreading. Nerve a 

 little wider. Cells slightly shorter than in the type, the supra- 

 Naturalist, 



