338 



THE BOOK OF CHOICE FERNS. 



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

 almost stalked, nattish, 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. V. 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 from 3in. to 5in. in height, and is perfectly constant. — Lowe, Our 

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



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



A more or less distinctly marked variety, with broad fronds 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-lin-e-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. — Lowe, Our 

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



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



A very handsome form, with gracefully-arching, deep green fronds l^ft. 

 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. 



