CHAKACTEE3 OF THICES AND GENERA, 207 



Species with both free and anastomosing veins, the technical 

 character consisting- in all ha'sdng a reniform iniusium. 

 Schott restricted the genus to the species having anas- 

 tomose veins only. 



In the "Species Filicum" thirty-four species come under 

 this character, of which the following are the principal. 

 It is well to notice that great confusion exists in the 

 synonyms of many of the species ; for instance, Aspidmm 

 violle, which is a very cosmopolitan species, has no less 

 than a dozen names placed under it as synonyms, some 

 having erect and others decumbent vernation, which 

 evidently marks them to be distinct species, but at the 

 same time possessing no special marked difference in the 

 character of the fronds. They present at least two very 

 distinct modes of growth, one set having fasciculate verna- 

 tion and another uniserial, thus forming two groups, which 

 may be viewed as characteristic of two natural genera. 



Seat. 1. — EuNEPHRODiuii. 



Vernation fasciculate, dectimheiit or erect, in some arhoroid. 

 * Fronds linear lanceolate, entire or pinnatifid. 



Sp. N. Cumingianum, /. Sm. Bot. Voy. of Herald, Kunze, 

 Fil., t. 9, fig. 2 ; N. stenopteris, Hooh. ; N. simplioifolium, 

 /. 8m., Hooh., Second Gent, of Ferns, t. 19. {Polypodium 

 sect. Ooniopteris, Hooh. Sp. Fil.) 



** Fronds pinnate. 



f Pinnce hroad, serrated or entire, or sub-tripinnatifid, all or 

 nearly all tlie venules anastomosring . 



Sp. N. acrostichoides, /. Sm-. ; N. lineafcum, Pr. ; N. gra- 

 nulosum, /. Sm. (v v.). Pot. Voy. of Hercdd {N. glandulo- 

 sum, Hooh. Sp. Fil.) ; N. cyatheoides, Kaulf, {PolysticJium 



