128 CHARACTERS OF TRIBES AND GENEEA. 



glossum, but are distinguished by the veins being connected 

 at the margin by a continuous zigzag or straight vein, 

 similar to that of the genus Olfersia, but which has pinnate 

 fronds, and also differs in the nature of its vernation. 



Sp. A. nervosa (JBory) (v v.) (J.. subdiaphanum, Hook, 

 and Grev.) ; A. longifolia (Jacq.) (v v.) ; A. gorgoneum 

 (Kaulf.) 



42. HYMENODIUM, Fee (1844). 

 Dictyoglossum, /. Sm. t 1846 ; Acrosticlium sp., Hook. Sp. Fit. 



Vernation fasciculate, decumbent, thick. Fronds con- 

 tiguous, stipitate, simple, entire, from 1 to 2 feet in length, 

 broad elliptical, smooth or squamiferous, subcoriaceous, 

 Veins uniform, reticulated, forming elongated oblique 

 areoles. Fertile fronds the same shape as the sterile ones, 

 but smaller. 



Type. AcrosticJium crinitum, Linn. 



Illust. Hook, and Grev., t. 1 ; Hook. Fil. Exot., t. 6 ; 

 Moore Ind. Fil., p. 6 A. ; J. Sm., Ferns Brit, and For., 

 fig. 31. 



OBS. The reticulated venation distinguishes this genus 

 from the two preceding ; it consists of three known species, 

 two being natives of the West Indies and one of the 

 Sandwich Islands. 



Sp. H. crinitum (Linn.) (v v.) ; H. reticulatura (Kaulf.) 

 (v v.) ; H. pachyphyllum (Kze.). 



43. ANETIUM, Splitg. (1840). 

 Hemionitis, Hook. Sp. Fil. Antrophyum Fee. 



Vernation uniserial, sarmentum slender. Fronds distant 

 simple, oblong elliptical, acuminate, 6 to 20 inches long, 



