322 THE BOOK OF CHOICE FERNS. 



Including the stalks, the fronds seldom exceed 1ft. in length. — Lowe, Our 

 Native Ferns^ ii., fig. 600. Nicholson, Dictionary of Gardening, iii., p. 393, 



S. Y. bimarginato-cordatum — bim-ar-gin-a'-to-cor-da'-tum (double- 

 margined, heart-shaped), Moore. 

 In this singular and pretty form, the much-contracted, narrow fronds, 

 scarcely more than lin. broad, have their upper surface very warty ; they also 

 show double marginal ribs at their back, and bear at the base, next the 

 stalk, two large, roundish or heart-shaped lobes. — Druery, Choice British 

 Ferns, p. 136. 



S. Y. bimarginato-multifidum — bim-ar-gin-a'-to-mul-tif'-id-um (double- 

 margined, much cleft), Moore. 

 The fronds of this variety, ^in. or less in breadth, are double-margined 

 on their under-side ; their upper surface is broken up into a quantity of very 

 thickly-set, more or less variable-sized projections and depressions slanting 

 outwards, often slightly pouched here and there, and projecting irregularly 

 beyond the margin. They have a large, much-divided summit, made up of 

 narrow branches bearing spore masses along their margins, — Lowe, Our 

 Native Ferns, ii., fig. 674. 



S. Y. bimargfinatum — bim-ar-gin-a'-tum (double-margined), Lowe. 



This very curious, distinct, and constant form was originally found at 

 Rotherham, in Yorkshire, and subsequently at Brecon, at Ulverston, and at 

 Oldstead, and has been raised from spores by Mr. C. Elworthy. Its fronds, 

 6in. to 9in. long and Jin. to ^in. wide, are truncate at the base and usually 

 simple, though sometimes multifid at their summit. Their margin is cut into 

 narrow, shallow lobes, which are toothed or twice cleft. The lobes are 

 margined on both surfaces and their upper surface is irregularly broken into 

 cavities and excrescences. — Lowe, Our Native Ferns, ii., flg. 649. 



S. Y. capitatum — cap-it-a'-tum (headed), Lowe. 



A very distinct form, originally found near Littleham, in Devonshire, 

 with a crimped margin becoming flat near the rachis. The base of the fronds 

 is lobed on one side only, and their summit, being much branched, forms 

 a compact, multifid head.— Zoioe, Our Native Ferns, ii., p. 338. 



