GENERAL REMARKS. 



599 



Cryptogramma PL CXXXVIII. Fig. II. 2. scarcely differs 

 from Allosurus, the sori are linear, and the veins are always 

 forked and and the involucra more involute. 



There is certainly some difference between the plants 

 referred to Lomaria. Thus I have one from the H. B. 

 Kewensis, in which the sori are really continuous, occupying a 

 thick intromarginal vein (PL CXXXVIII. Fig. II. 4, h 3 casta) 

 the veins are very indistinct, and judging from the back of the 

 frond, very oblique. 



Between this and Stegania lanceolata of Brown, there is no 

 generic difference. PL CXXXVIII. Fig. II. 6. a outer, b 

 inner vein, c costa. 



Strutheopteris; in this, the inner involution is carried to such 

 an extent that the scarious margin is carried under the sori, 

 and there attached (PL CXXXVIII. Fig. II. J.) b. c. outer 

 costa an inner ditto a line of involution. In other words both 

 involucra are confluent, the veins are stout, and carried 

 beyond the sori (PL CXXXVIII. Fig. II. 8, g costa ; e outer ; 

 f inner) which are situated on the ramifications of, and 

 continuation of the secondary veins. 



I am not certain whether the involucra are continuous. 

 It is hence nearly approxinated to Blechnum. 



Onoclea. Shews that the involucra are not continuous. 



The outer is involute, and the sections of the frond adhere : 

 the inner are as membranous as those of Struthiopteris, are 

 arched over the very large sori, and open externally. 



The veins are prolonged beyond, and are solitary with res- 

 pect to the should be lobes of the fertile pinnula. 



There are receptacles, the sori are among the largest. 

 Onoclea, and Struthiopteris, ought not to be disjoined, unless 

 the general involucra of the former adheres to the partial 

 one. 



