POLYPOBIEiE. Ixix. 



Istes an universal indusium ; the receptacles medial, prominent. 

 Veins simple or forked, from a central oosta j venules free. 



Fronds dimorphous, the sterile herbaceous, pinnato-pinnatifid ; 

 the fertile pinnate, with the pinnae much contracted, moniliform, 

 the margins rolled inwards so as to cover the sori. Bhizome 

 erect caudioiform, producing stolones. — A strikingly handsome, 

 tallish and easily recognised fern, owing to the entire dissimi- 

 larity between the fertile and sterile fronds ; yet technically very 

 little removed from Polypoclmim, scarcely differing indeed, ex- 

 cept in the production of contracted and revolute fertile fronds. 

 The European and North American plants belonging to this 

 genus, though quite distinguishable, are rather to be considered 

 as varieties than species. 

 Ex. : S. germanica, WiUi. ; and ;8 penBylvanioa. 



98. JAMESONIA, Jffooker and Greville, Icon. Fa. t. 118. 



Ptebidis sp., Aicct.; Gtmitogbammatis ap.fAuct.; Allosobi ap.^JPresl; 

 Anogeammatis sp., Fee; Cheit-anthis sp,, X>e8vaux. 



Son spuriously-indusiate, few, rotundate, crinite, at length 

 confluent over the whole disk, not covered by the revolute her- 

 baceous margins of the pinnse (or pinnules) ; the receptacles 

 punotiform near the base of the venules. Vdns forked from a 

 central costa; venules free. 



Fronds coriaceous, usually linear elongate, pinnate with nume- 

 rous crowded concave, oblique or imbricated roundish cordate 

 pinnae, sometimes bi-pinnate. Eachis villose; " indefinite in evo- 

 lution," (Fee.) Ehizome creeping or tufted. — A peculiar weU- 

 marked group as respects the majority of the species ; neverthe- 

 less, having but slight technical characters. 



Ex. : J. imbricata, IHc. and Or. 1 J. verticalia, Kze. 

 J, scalaris, Kze. J, cinnamomea, Kze. 



J. hispidula, Kze. \ 3. paleacea, Kze. 



(b) Margins of the fronds not indusioid, 

 * Veins free, 



Q 9 . NOTHOCHIiiETf A, S. Brown, Prod. Fl. N. Holt 145. 



CiiTciNALis Desvaux; Abgteochosma, J. Smith; Eeiochosma, J. 

 Smith Lepichosma, J. Smith; GTMifOGEAMMAns sp., Kaulfuu; 

 CApril 1857.] G 



