337 CHYPTOGAMIA.— FILICES. 



598. SCOLOPENDRIUM. Sori linear, transverse 

 scattered. Invoiucrum double, occupying both 

 sides of the sorus, superficial, and opening like 

 a longitudinal suture. 



399. WOODWARDIA. Sori oblong, distinct, straight. 

 parallel with the ribs of the frond, on either 

 side. Invoiucrum superficial, arched, opening 

 inward. 



GOO. PTERIS. Sori in a continued marginal line. 

 Invoiucrum formed of the inflexed margin of the 

 frond, opening inwards. 



601. ADIANTUM. Sori oblong or roundish. In 

 volucra membranaceous, arising from distinct 

 portions of the frond turned in, opening inwards. 



602. CHEILANTHES. Sori punctiform, distinct and 



marginal, each covered with a scale-like mar- 

 ginal invoiucrum opening inwards. 



603. HYMENOPHYLLUM. Sori marginal. Capsule* 



sessile, inserted upon a common cylindrical re- 

 ceptacle, within a 2-valved invoiucrum of the 

 same texture as the frond ; valves plane, exte- 

 rior free. 



604. ONOCLEA. Sori indeterminate. Capsules co 



vering the whole lower surface of the frond. 

 Invoiucrum resembling a berry, formed of the 

 frond, opening, but not expanding. 



605. STRUTHIOPTERIS. Capsules densely cover 



ing the back of the frond. Invoiucrum squami- 

 form, marginal, opening inwards. 



** Capsules destitute of a ring, vascular-reticulate., 

 pellucid, radiate at the tip and substriatc, longitudi 

 nally {and often externally) opening. 



G06. OSMUNDA. Capsules subglobose, pedicellate, 

 striate, half-bivalved, paniculate. Invoiucrum 0. 



G07. SCHIZJEA. Spikes unilateral, flabellate, aggre- 

 gate. C&psules subturbinate, striate longitudi- 

 nally and radiate, opening laterally. Invoiu- 

 crum continuous, formed of the inflexed margin 

 of the spikes. 



r308. LYGODIUM. Capsules in 2 series on the back 

 of appendages to the frond, radiate-striate, or 

 wrinkled, opening on the inner side., from thr 



