158 acotyledonS. — filices. Botrychkimi 



linear undivided or bifid, and, as well as the extremity of the 

 axillary involucre, spinuloso-dentate. Br. E. B. t. 162. Hook, 

 in Fl. Lond.with ajigure. Trichomanes tunbridgense. Light f. 

 p. 68). 

 Hab. Wet rocks in the Highlands, abundant. In the greatest profu- 

 sion on rocks near the road side along the shores of Loch Lomond. 



Div. II. OsMUNDACE.E. CapsuUs destitute of a ring, vasculoso- 

 retiadate, pellucid, at the top, radiated or sulstriated, and 

 hence longitudinally [and often externally) opening. Br. 



II. OSMUNDA. 

 Capsules subglobose, pedicellate, striated, half-bivalved, panlcii- 

 lated. Involucre none. 



1. O. regaVis, fronds bipinnate, pinnules lanceolate nearly entire 

 the lower base somewhat auricled, the inferior ones opposite, 

 fructifying panicle bipinnate at the extremity of the frond. 

 Willd. E. B. t. 209. Light/, p. 653. 



Hab. Boggy places, especially near water ; at the margins of lakes, 

 not unfrequent. 



2 — 3 feet high. The largest and liandsomest of the British Ferns, 



Div. III. OPHioGLOssEiE. Capsules of one cell, adnate at the 

 base, subglobose, coriaceous, opaque, destitute of a ring, not 

 cellular {sometimes connate), semi-bivalved. 



12. OPHIOGLOSSUM. 

 Capsules naked upon an articulated distichous spike, connate, 

 one-celled, transversely opening, two-valved. IVilld. 



1. O. vulgatum, spike cauline, frond ovate obtuse. E. B. t. 108. 

 Lightf. p. 65 1 . Hook, in E. B. with a figure. 



Hab. Meadows and moist pastures, but not very common, as about 

 Dunsinnane liill ; in Gowrie, Sec. Lightf. Woodhall, by Glasgow, 

 Hopk. Old lee pasture at Fossil, near the porter's lodge, Glasgow, 

 Mr. Murray. Den of Rechip, Mr. Arnott. Appin, Capt. Carmichael. 



13. BOTRYCHIUM. 

 Capsules subglobose, adnate with the racemed, compound rachis, 

 distinct, naked, one-celled, valves two, connected behind, 

 transversely opening. IVilld. 



1. Br. L?/WGf/-/a, scape with a single frond above, frond pinnated, 

 pinnae lunate entire. Willd. Hook, in Fl. Lond. luith afgure. 

 Osmunda Lunaria, Lightf. p. 652. E. B, /. 318. 



Hab. Mountain pasture. North of Linlithgow, Slhbald. West coast of 

 Ross-shire and in Skye, Lightf. Pentland hills, Caroline Park, 

 Cluny, &c. Mr. Arnott. Near Largs, Bute, Arran, and banks of the 

 Clyde below Greenock, &c. Mr. Murray. Appin, Capt. Carmichaet. 



In some specimens gathered by Capt. Carmichael tliere were capsules 

 produced round the lower segments of the fronds. 



