CTIll. GENEEA OP FSBNS : 



of few (usually 2 — i, sometimes 5 — 6, and in one or two species 

 8 — 12) spore-cases, whicli are sessiLe, deciduous, globoso-pyri- 

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

 tacles terminal or medial or axillary on the yenules. F«as 

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

 anterior one usually soriferous. 



Fronds rigid, rarely simply pinnatifid, usually once or oflener 

 dichotomously branched, the ultimate branches pinnatifid or 

 pinnate ; the segments small OTate or orbicular and sometimes 

 remarkably revolute, or larger plane linear or oblong. Bhizome 

 creeping. — ^There appear to us no material distinctions between 

 the plants referred to Gleichema and Mertetaia; we therefore 

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

 to have reticnlated veins, and Sicriopferis veins anastomosing at 

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

 these as probably errors of observation. 

 § CalymeUa. — Sori terminal^ spore-cases 2 — 4. 



Ex. : G. mpestris, B. Br. I G. alpina, B. Br. 



G. polypodioides, Sn. G. dicarpa, B. Br. 



G. semivestita, XoiiZZ. | G. circmata,Stf. (miciophylla, ^..^ 



§ Merteima. — Sori medial or axillary ; spore-cases 3 — 13. 



Ex. : G. eigantea. Wall. 



G. CmmiQghaim, Setcard, 

 G. dichotoma. Hook. 

 G. flagellaris, Spreng, 



G. flabellat^ B. Br. 

 G. pubeseens, KfK 

 G. pectinata, JVe«?. 

 G. simplex, Mook, 



Order— POLYPODIACE^. 3V»e— TRICHOMAISTNE.^. 



(a) Involucres urn-shaped or tubular. 

 * Veins free. 



153. LOXSOMA, .K. Broum MS: A. Cunningham, Comp. 

 Sot. Mag. ii. 366, t. 31—32. 



Day ALUS sp., A. Cunningham MS j Tsichokants sp., Sarvey MS. 



Sori involucrate, seated in extrorse-marginal cysts placed at 

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

 form much esserted receptacles, which are free within the cysts 

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



