Cviii. GENERA OF FERNS : 



of few (usually 24, sometimes 56, and in one or two species 

 8 12) spore-cases, which are sessile, deciduous, globoso-pyri- 

 form, sometimes concealed by the revolute margins ; the recep- 

 tacles terminal or medial or axillary on the venules. Veins 

 simple or forked, from a central costa ; venules free, the lower 

 anterior one usually soriferous. 



Fronds rigid, rarely simply pinnatifid, usually once or oftener 

 dichotomously branched, the ultimate branches pinnatifid or 

 pinnate ; the segments small ovate or orbicular and sometimes 

 remarkably revolute, or larger plane linear or oblong. Rhizome 

 creeping. There appear to us ^no material distinctions between 

 the plants referred to Gleichenia and Mertensia; we therefore 

 agree with those who combine them. Sticherus of Presl, is said 

 to have reticulated veins, and Hicriopteris veins anastomosing at 

 the margin, but we have seen no such structure, and regard 

 these as probably errors of observation. 

 Calymella.Sori terminal, spore-cases 24 



Ex. : G. rupestris, R. Br. I G. alpina, It. Br. 



G. polypodioides, Sm. G. dicarpa, R. Br. 



G. semivestita, Labill. \ G. circinata, Sw. (microphylla, Sr.J 



Mertentia Sori medial or axillary ; spore-cases 312. 



Ex.: G. 



: G. gigantea, Wall. 

 G. Cunninjrhami, J 



G. dichotoma, Hook. 

 G. flagellaris, Spreng. 



Heicard. 



G.flabellata, S. Sr. 

 G. pubeseens, Eth. 

 G. pectinata, Presl. 

 G. simplex, Hook. 



Order POLYPODIACEJ3. Tribe TRICHOMANINE^!. 



(a) Involucres urn-shaped or tubular. 



* Veins free. 



153. LOXSOMA, -B. Brown MS: A. Cunningham, Comp. 

 Bot. Mag. ii. 366, t. 3132. 



DAVALM2E sp., A. Cunningham MS ; TEICHOMAITIS sp., Harvey MS. 



Sori involucrate, seated in extrorse-marginal cysts placed at 

 the sinuses of the marginal teeth, the veins continued into fili- 

 form much exserted receptacles, which are free within the cysts 

 or involucral cups, and are clothed throughout with obovate sub- 



