270 CHAEACTERS OP TEIBES AND GENERA. 



pinnae about half an inch in length, differing from true 

 Lindscea only in the upper margin, being dentate, each dent 

 bearing a single round terminal sorus, furnished with a 

 bilabiate indusium, upon this character, Bory refers it to 

 Dichsonia, in which genus it is retained by Swartz and 

 Willdenow, along with the arborescent Dicksonia ; it was 

 afterwards referred by Desvaux to Davallia, under which 

 genus it stands in the " Species Filicum " (sect. Odontoloma) ; 

 which is certainly a more natural position than being ranked 

 with the lofty JJichsonias. Presl places it in the genus 

 Saccdloma. In Moore's Index it is found under the genus 

 Acrophorus {A. re-pens), which genus was originally founded 

 by Presl on a solitary species*, to which Moore adds no less 

 than eighteen species, the greater number of which in this 

 arrangement come under four distinct genera, namely, 

 Odontoloma, Odontosoria, Microlepia, and Lettcosteffia, the 

 latter differing from the former in having articulate verna- 

 tion, and, therefore, belonging to Eremobrya. To depend 

 on the character of the sori alone, many multifid species of 

 Lastrea and Polystichum, with terminal, marginal sori, and 

 even Mr. Moore's genus, Biclisodov, may be added to 

 Acrophorus, all agreeing strictly in the sori being terminal, 

 and the special indusium conniving with the indusoid mar- 

 gin. It is, therefore, only by studying the difference in 

 habit that natural groups of species can bo formed. 



151. — ScHizoLOMA, Gaud. (1826). 



Lindscea, Hook. Spi. Fil. 



Vernafion sarmentose, short. Fronds contiguous, sub- 



fascicnlate, pinnate ; pinnai oblong, or linear lanceolate, 



costae central. Veins forked ; venules anastomosing, form- 



* See Acro^ihorus, page 221. 



