338 THE BOOK OF CHOICE FERNS. 



thickened margin, and there is apparently carved or broken up into small, 

 almost stalked, flattish, thickly-set lobes, variable in outline, and forming 

 confused, conspicuous lines. The spore masses are frequently disposed on the 

 Upper surface of the fronds. — Lowe, Our Native Ferns, ii., fig. 619. 



S. Y. spirale — spi-ra'-le (spiral), Moore. 



This singular, pretty, and distinct form, producing thick, leathery fronds 

 twisted like a corkscrew and terminating in a sharp point, was found 

 simultaneously in Guernsey and at Nailsworth, Gloucestershire. It usually 

 measures fi?om Sin. to 5in. in height, and is perfectly constant. — Lowe, Our 

 Native Ferns, ii., fig. 631. Druery, Choice British Ferns, p. 142. 



S. Y. striatum — stri-a'-tum (striped), Moore. 



A more or less distinctly marked variety, with broad fi:-onds of a 

 somewhat wavy nature, obliquely streaked with yellowish-green on a deep 

 green ground, giving the whole plant a striated appearance. — Lowe, Our 

 Native Ferns, ii., p. 320. 



S. Y. SUblineato-striatum — sub-linre-a'-to-stri-a'-tum (somewhat lined 

 and striated), Lowe. 

 A very interesting variety, originally found in Devonshire. The fronds, 

 of normal dimensions, are deeply cleft at their edges and margined with a line 

 along their under-surface. It differs from other marginate varieties in having 

 raised lines across the upper surface of the fronds, and the veins, being of 

 a particularly dark colour, give the plant a striped appearance.— iowe. Our 

 Native Ferns, ii., t. 53a ; New and Rare Ferns, t, 51a. 



S. Y. SUbmarginatum— sub-mar-gm-a'-tum (somewhat margined), Wollaston. 

 A very handsome form, with gracefuUy-arching, deep green fronds IJft. 

 to 2ft. long, having their margins cleft into irregular lobes, as if torn, and 

 these marginate-toothed. On the under-surface, following the irregularity of 

 and near to the marginal lobes, is a thin, irregular line, sometimes altogether 

 absent from parts of the frond. This plant has been found in Ireland, in 

 Guernsey, and in various parts of England.— Lowe, Our Native Ferns, ii., 

 t. 52a ; New and Rare Ferns, t. 24a. 



