124 PTERIS TREMULA. 



hundred species, ninety per cent of seedling Ferns will be found 

 to be one of the above-mentioned four species. 



An evergreen greenhouse Fern. 



Native of New South Wales, New Holland, Nepal, and 

 New Zealand. 



Fronds glabrous, slender, and deltoid; tri-quadripinnate; the 

 pinnules linear, caudate at the apex; narrow linear-oblong 

 segments, margin crenate, apex blunt. 



Stipes one half the length of the frond, green when young, 

 afterwards reddish brown; terminal, adherent to a somewhat 

 creeping rhizoma. 



Length of frond three feet; colour bright green. 



Veins distinctly seen, being paler in colour than that of the 

 frond. 



Sori linear, continuous to the apex of the pinnules, where 

 they frequently join; colour reddish brown, and prominent. 

 Occasionally fronds will be found with interrupted sori. 



My thanks are due to Sir Oswald Mosley, Bart., of Rol- 

 leston Hall; M. Schott, Director of the Imperial Gardens, 

 Vienna; Mr. Lamb, Gardener to F. Wright, Esq., of Osmaston 

 Manor; and to Mr. Sim, of Foot's Cray, for plants of this 

 species. 



It is in the Catalogues of Messrs. Rollisson, of Tooting; 

 Parker, of Holloway; A. Henderson, of Pine-apple Place; Veitch, 

 Jun., of Chelsea; R. Sim, of Foot's Cray; Booth, of Hamburg; 

 Cooling, of Derby; Kennedy, of Co vent Garden; and Stansfield 

 and Son, of Todmorden. 



The illustration is a portion of a frond from a plant in my 

 own collection. 



