1047 



" Sorus in substantia ipsa frondis sen intra ejus laminas immersus, aut in apice 

 venae venulaeve sessilis. Indusium tubulosum, tubo integro, limbo integio aut bipar- 

 tite. Receptaculum filiforme, exsertum, inferne capsulis spiraliter obsitum, caeterum 

 nudum punctis excavatis spiraliter ambientibus ornatum." — p. 10. 



It will be observed that the main distinction between the two tribes 

 is found in the tubular involucre of the Trichomanoideae, the tube be- 

 ing invariably entire, and its limb either entire or bipartite, the former 

 character distinguishing the Trichomanese, the latter the Didymoglos- 

 seae. In this definition we feel scarcely inclined fully to concur, since 

 in the first group we almost invariably find the limb of the involucre 

 bipartite, or at least emarginate on each side, at its junction with the 

 wing or margo. 



Genus, Feea, Bory. 



" Frondes dissimiles. Steriles : Venae internae, pinnatim alternae, siraplices aut 

 saepius furcatae. Fertiles : Venae creberrimae, brevissimas, pedicelliformes, soriferae. 

 Sorus in vena pedicelliformi apicalis. Indusium clavato-infundibuliforme, ore crenu- 

 lato. Receptaculum exsertum, tenuiter clavatum, basi capsuliferum. Capsulae ses- 

 siles, lenticulares. Rhizoma adscendenti-repens, polyrhizum. Frondes sparsae, valde 

 approximatae ita ut fasciculatae videantur, transparentes, stipitats, steriles a fertilibus 

 difformes. Frons sterilis profunde pinnatifida aut pinnata, laciniis linearibus obtusis 

 obscure repando-crenulatis, pinnis adnatis ovato-oblongis obtusis crenulatis, stipite ba- 

 si tereti, in una facie supra canaliculato in altera convexo, rachi hinc plana illinc con- 

 vexa, costis tenuibus vix prominulis, venis internis pinnatim alternis angulo acuto 

 patentibus simplicibus aut saspius furcatis venulisque ante marginem frondis desinen- 

 tibus, parencbymate e cellulis bexagono-subrotundis constructo. Frons fertilis lon- 

 gius stipitata, ad meram rachidem reducta, venis brevissimis creberrimis pedicellifor- 

 mibus soriferis. Indusium clavato-infundibuliforme, saepe incurvum, ore crenulato. 

 Receptaculum indusio triplo longius, filiformi-subclavatum, basi capsuliferum, reliqua 

 longitudine punctis impressis spiraliter ambientibus minutis, inde sub microscopio 

 tantum visibilibus, ornatum." — p. 10. 



1. F. polypodina, Bon/, Diet, Class, t. QB. Trich. spicatum, Hediv. Sw. T. spi- 

 cisorum, Desv. T. elegans, Rudge, partim. Hook. Exot. Fl. t. 52. 



2. F. nana, Bory, Diet. Class. 1, t. 69,/. 1. Tri. botryoides, Rich, in Kaulf. Herb. 



Genus, Hymenostachys, Bory. 



" Frondes dissimiles. Steriles : Venae internae, pinnatim alterna3, simplices aut 

 saepius furcatae. Fertiles: Venae creberrimae, parallels, simplices, apice soriferae. So- 

 rus intramarginalis, immersus. Indusium campanulatum, ore truncate integro. Re- 

 ceptaculum exsertum, filiforme, basi capsuliferum. Capsular sessiles. Stirpes tropicae, 

 americanae, speciosae. Rbizoma adscendeuti-repens, polyrbizum. Frondes sparsae 

 quidem sed valde approximatae ita ut fere fasciculatae videantur, stipitatae, hygrosco- 

 picae, transparentes, steriles a fertilibus difformes. Frons sterilis pinnata aut pinnatifi- 

 da, pinnis adnatis laciniisque oblongis obtusis iuaequaliter augulato-dentatis repandisve; 

 costae tenues, vix prominulae ; venae internee, tenues, pinnatim alternae, angulo acuto 

 patentes, simplices aut saepius furcatae, venulisque ante marginem desinentes. Frons 



