127 



(b) Sorus of same (much magnified). 



(c) Polystichum aculeatum Roth. Pinnule ( X 4). 

 (ti) Sorus of same (much magnified) 



(e) Cyrtomium falcatutn Presl. Portion of pinna ( x l*). 



(f) Aspidiunt cicutarium Sw. Portion of frond ( x l^). 



(g) Pleocnemia membranacea. Portion of frond (x Ig). 

 (h) Lastrea calcarata Hook. Portion of pinna ( *2). 

 (k) Nephrodium molle Desv. Portion of pinna ( x l). 

 (/) Nephrolepis exaltata Schot. Portion of pinna (x ]). 

 (o) A typical sorus of /, g, h, k and I. 



GENUS XXIX. CYRTOMIUM PRESL. 



(Deriv. unknown.) 



Indusium round, attached by the centre ; 

 veins generally anastomosing with free veinlets 

 proceeding from their junction. 



Cyrtomium falcatum Presl. 



Caudex erect. Stipes tufted, 6-12 inches long, 

 densely clothed with huge brown scales. 

 Frond 1-2 feet long, lanceolate, pinnate : 

 pinnae stalked, ovate, acuminate, upper base 

 suddenly narrowed, often auricled, lower base 

 obliquely cut away, margin entire or slightly 

 undulated. Texture leathery. Surfaces naked, 

 shining. Rachis scaly like the stipe. Sori 

 scattered over the under surface. [Fig. 41-^.] 



The variety caryotidem Bedd. has larger, 

 sharply toothed, slightly lobed pinnules, some- 

 times auricled on both sides at the base. It is 

 scarcely separable from the type and is best 

 considered as a mere form of C. falcatum. 



