CHAEACTEES OF TEIP.ES AND GENEEA. 2-17 



Eori with AlsopJiila,! refer tliem to the ]-Iymenosiegia section 

 of that genus, restricting Heniitelia to about a dozen species, 

 which are readily distinguished i'vouij4lsopJiila by the lower 

 venules anastomosing opposite the sinus of the laoinae, 

 but in some species this character is wanting, the whole of 

 the venules being free ; their habit of growth and broad 

 divisions of the fronds is indicative of their relationship to 

 be with Heniitelia rather than with Alsophila ; it, however, 

 must be admitted that although the typical species of 

 Cyatliea, HemHelia, and AhopJtila, warrant their separation 

 as distinct genera, the transition species however appears 

 to unite them so as to form one natural group. The 

 species as here restricted to Setnitelia, are all natives of the 

 West Indies and Tropical America. 



* Fronds pinnate ; pinnce entire. 



Sp. H. speciosa (Kaulf.) (v v.) ; H. Lindeni {Hool:.) ; 

 H. grandifolia (Spreng.) (v v.) ; H. obtusa (Kaulf.) (v v.) 



** Fronds hipinnatifid. 



H. Imyrana {Hook.} (v v.) ; H. Karsteniana {Hook.) 

 (v V.) ; H. horrida {B. Br.) (v v.) ; H. marginalis (/. Sm.). 



132.— Alsophila, E. Br. (1810). 

 Hook. Sp. Fil. ; Amphicosmia Gard. 



Vernation fasciculate, erect, arborescent. F-ronds bi-tri- 

 pinnatifid, 5 to 15 feet long. Veins simple or forlied, free. 

 Sori axillary or medial. Receptacles elevated, globose, or 

 columnar. Indusium seml-calciform, or small and squamre- 

 form, often wanting, in some trichiferous. 



TjiJe. Cyatliea muUijiora, Sm. 



