CHARACTERS OF TRIBES AND GENERA. 117 



appearance and venation it is evidently allied to Anapeltis ; 

 but its linear oblique sori being special not formed by the 

 confluence of punctiform receptacles is considered sufficient 

 character to retain it as a distinct genus. 

 Sp. M. persicariaefolia, Presl. 



Tribe 4. HYMENOLEPIDEJ3 (Plate 4). 



Fronds simple or pinnatifidly lobed, the fertile wholly or 

 partially contracted. Veins anastomosing. Sori linear, 

 continuous, transverse. 



OBS. This Tribe consists of about a dozen or more 

 species agreeing in general habit and venation with the 

 sections Pleopeltidece and Phymatodece of the preceding tribe, 

 differing only in the fertile frond being usually more or 

 less contracted, generally in the form of rachiform spikes, 

 on which account several of the genera which I now place 

 here have been placed by authors in the genera Tcenitis 

 and Acrostichum, such relationship being consequent on the 

 fertile frond, or in some, the fertile portion only, being 

 contracted, thus bringing the normal punctiform recepta- 

 cles so contiguous to one another as to form a general 

 linear sorus ; this view is borne out by fronds of some 

 species bearing punctiform sori as well as linear. 



33. DEYMOGLOSSUM, Presl (1836). 

 Hook. Sp. Fit. ; Tcenitis sp. auct. 



Caudex slender surculose. Fronds simple, entire, 1 to 

 4 inches long, of two forms, the sterile subrotund, elliptical, 

 the fertile contracted, linear. Veins obscure ; venules com. 

 poundly anastomosing. Receptacles elongated, compital. 

 Sori linear, continuous transverse, ultra marginal, furnished 

 with stellate indusioid scales. 



