St'OLOrKNJJKlUM VULGAUK. 



349 



divisions much narrower, and often again s])lit into slireds, the 

 irregularly-jugged edges of the segments marginate. Mviparous. 



Fig. 758. 



Fig. 759. 



Plicatum, Clapham. (Fig. 758.) — Raised from spores of 

 jlaco-tinctum by Mr. A. Clapham, of Scarborough. Beautifully 

 plicate and muricate. Length nine inches, width one inch and 

 a half. Crisped on the margin and muricated in the middle 

 of the fronds on either side the costa. Apex acuminate. 



SuPRALiNEATO-CRispUM, Lowc. (Fig. 759.) — A dwarf form. 

 Fronds four inches in length, of which one half is the stipites. 

 Outline irregular, and the margin minutely dentate, supra- 

 lineatc in an irregular line, close to and on either side of 

 the costa, the fronds somewhat crisped. 



Makginato-convexum, Lowe. — Length fourteen inches. 

 Intcrru2:)tedly marginate, the margin irregularly lacerated, 

 contracted for an inch in length in the centre of the frond, 

 and more regulaily lacerated above, forming })rominent lobes, 

 with a bideutate segment at the base of the sinuses. Remarkable 



