CYSTOPTERIS. 105 



The midveiii of the pinnules is nearly straight, with a 

 venule, simple or divided, branching off to each lobe, one 

 branch extending to the point of each marginal tooth. The 

 small roundish sori are rather numerous, but not confluent, 

 borne near the margin, and covered by a concave mem- 

 branous indusium. 



This species, which is cultivated like the other species of 

 Cystopteris without difficulty, has been found (formerly in 

 abundance, now, we believe, almost exterminated) on an old 

 wall at Leyton, in Essex. Indeed, its claim to aboriginality 

 is strongly suspected, a small, much-divided form of Cysto- 

 pteris fragilis being supposed to have been mistaken for it. 

 The Scotch and Welsh plants which have been called Cysto- 

 pteris atpina are probably open to this objection, but there is 

 reason to believe the Essex plant to have been genuine ; and 

 I have fronds of the true plant, communicated by a Eern 

 cultivator, Mr. Shepherd, of Liverpool, which, he informs 

 me, were gathered in Derbyshire and Yorkshire. It occurs 

 in the alpine parts of southern Europe. 



Cystopteris regia is another name for this elegant plant, 

 which has also been called Cyatliea regia and Cyathea incisa, 

 Cystea regia, Polypodium alpinum, Aspidium regium, and 

 Polypodium trifidum. 



