89. POLYPODIACEvE. 209 



Var. irriguum, or Rhceticum, Roth. Fronds rigid, nearly erect, 

 tufted, scarcely bipinnate; pinnso distant, deflexed; pinnules 

 narrow, linear-lanceolate, deeply cut, marginal lobes incurved. 



Common. On exposed boggy moors. Mearns moor; above Raslifield on the 

 Holy Loch ; Cumbrae ; Bute and Arran. 



Var. molk, Roth. Stipes short. Frond pinnate, pinnules flat, 

 toothing shallow, combined below by a narrow wing on the 

 secondary rachis, not growing to a large size, leafy looking from 

 the short broad pinnules, very tender. 



Shady places, not common. Hamilton; Cumbrae; Bute and Arran. 



Var. marinum, Moore. This seems a state of the last with 

 fronds 12 18 in. high, spreading or decumbent, scarcely bipin- 

 nate, pinnae longest in the centre of the frond, narrowing to the 

 base and apex ; pinnules very close, with rounded points ; lobes 

 scarcely developed, the cutting being shallow. 



Not common. Below Inverkip ; Cumbrae ; Bute and Arran. 



Var. incfoum, Hoff. Fronds large and broad, forming tufts 

 often 5 ft. high, tripinnate; pinnules deeply pinnatifid, often 

 upwards of an inch long, flat, teeth often narrow and long, giving 

 the plant a plumose elegant appearance. 



Common. Inmost of our woods. Gadder wilderness; Garscube woods; 

 Gourock ; Cumbrae and Arran ; very fine in Mountstewart woods, Bute. 



Var. laxum, Schu. Pinnas and pinnules wide apart, more lax 

 in growth than incisum, not incurved, lowest pinnule having a 

 large anterior basal lobe, prolonged into an auricle, forming an 

 apparent continuous line along the rachis of the pinnae, pinnules 

 narrow and flat. 



. Frequent. Hamilton ; Ardencaple wood, Helensburgh ; Bute and Arran. 



Var. odontomanes, Moore. Fronds broadly lanceolate, pinnse 

 acuminate, pinnules rather distant, decurrent, deeply pinnatifid 

 with long incurved irregular teeth. 



Frequent. Cambuslang; Kilmun; Rothesay, Thomas Moore; Arran, near 

 Lamlash. 



ASPLBNIUM. Sori linear oblong, straight. 



* Fronds bipinnate; lowest pinnce longer than the others. 



2. A. ADIANTUM-NIGRUM, L. Black Spleenwort. Rhizome 

 tufted. Fronds 6 12 in. high. Stipes long, dark brown or 

 black at the base. Fronds triangular, acuminate, bipinnate, the 

 lowest part tripinnate ; pinnules varying from obovate to ovate 

 and lanceolate. Sori narrow, oblong, at length covering the 

 whole back of the frond. Plant of a harsh texture, shining dark 

 green above, pale beneath. 



Frequent. On rocks, walls, and banks. (B) P. G 10. Cathcart; Cambuslang 

 and Calderwood glens; Crossbasket; Falls of Clyde; Cadzow; Bowling; Dum- 

 barton rock ; from Gourock to Arran. 



