CHARACTERS OF TRIBES AND GENERA. 171 



Gleiclienece and Cyathece, with either of which it has no 

 natural relationship in habit. This may be termed a truly 

 paradoxical Fern, for I find it difficult to fix its position in 

 any sequence of genera ; its partially reticulated sori 

 seem to point to Hemionites, and the form of its fertile 

 segments to Llavea and Allosorus, I therefore place it in 

 proximity to these genera. 



Sp. C. thalictroides, Brongn. (v v.) (farkeria Lockliarti, 

 Hook, and Grev., Ic. Fil., t. 97). 



OBS. In the Fern houses at Kew this Fern sprouted 

 abundantly on all moist surfaces, and grew luxuriantly in 

 the Victoria Lily tanks. 



Tribe ] 0. YITTARIE^] (Plate 10). 



Fronds simple, entire. Veins simple, reticulated or 

 compound anastomosing, combined at the margin in a 

 sporangiferous receptacle, which is seated in a slit or 

 groove. 



OBS.- This tribe contains about a dozen species of grass- 

 like Ferns, and as they do not well naturally associate with 

 other genera I follow Presl (in part) in ranking Vittariece 

 as a distinct tribe. Setting aside the difference of venation 

 as a divisional character, they would then rank with the 

 genera of the tribe Hymenolepidiece. 



80. YITTARIA, 8m. (1793), Hook. Sp. Fil. 

 Haplopteris, Pr., 1836 ; Tceniopsis, J. Sm., 1841. 



Vernation uniserial, sarmentum, short, furnished with 

 hyaline scales. Fronds contiguous, caespitose, simple, linear, 

 grass or tape like, from a few inches to 2 or 3 feet in 

 length, often pendulous or rigid sub -erect. Veins simple, 



