1057 



examined), but we see no reason for supposing it a departure from a 

 rule that seems little subject to exception. 



" VensB aul flabellatae pluries dicliotomo-furcatae, aut Scepius pinnatse simplices 

 ramosaeve, steriles apice acuto libero desinentes. Sorus aut exserlus (supramarginalis) 

 subsessilis, aut saepius immersus (intramarginalis). Indusium infundibuliformi-cylin- 

 draceum, limbo bipartite, laciuiis ovato-subrotundis obtusis deiuum patentibus. Re- 

 ceptaculum indusio longius, filiformi-setaceiim, plus minus elongatum, basi capsuli- 

 ferum. Capsulae sessiles, lenticulares. Rhizoma repens, filiforme, teres, ramosum. 

 Radices alteniEe, filiformes, simplices aut ramosas, radiculis aut paleis piliformibus 

 vestitae. Frons hygroscopica, tenera, immo tenerrima, transpareus, simplex aut varie 

 divisa, nempe lobata, pinnatifida, pinnata usque supradecomposita, paginis conformi- 

 bus. Stipes in quibusdam brevissimus 1. subnullus, in plurimis varie longus, in om- 

 nibus teres, in multis fronde decurrente marginatus. Costa media in speciebus venis 

 flabellatis donatis nulla aut non distinguenda, in reliquis utrinque teres, vix prominula. 

 VeucE vix prominulse, in D. punctato, in D. sphenoide et in D. Hookeri flabellatas 

 uni-pluries furcatee, venulis subparallelis angulo acutissimo exorientibus, in reliquis 

 speciebus venae pinnatim ramosae distantes multo pauciores, venulis divergentibus. 

 Parenchyma e cellulis rotundato-hexagonoideis constructum. Sorus in plurimis spe- 

 ciebus immersus sen intramarginalis, in quibusdam et quidem prtesertim in illis, quffi 

 venis flabellatis donata sunt et in illis, quae ad subgenus Chilodium nuncupatum per- 

 tinent, exsertus sen supramarginalis sessilis aut subsessilis aut brevissime pedicellatus. 

 Indusii tubus saspissime cylindraceus, rarius infundibuliformis, limbus liber bipartitus, 

 laciuiis vel partitionibus ovatis aut ovato-subrotundis, obtusis aut acutiusculis, primo 

 adpressis demum patentibus, in quibusdam speciebus purpureo-marginatis, in specie- 

 bus ad subgenus Chilodium relatis dentato-laciniatis, in omnibus reliquis speciebus 

 subgeuus primum sen Eudidymoglossiim constituentibus integerrimis. Receptacu- 

 lum indusio duplo — triplo — quadruplove longius, rectum aut plus minus flexuosum 

 (verosimiliter exsiccatione), setaceum, basi ima capsuliferum, in parte superior! nuda 

 punctis oblongis impressis spiraliter ambientibus notatum. Capsulae lenticulares, ses- 

 siles."— p. 22. 



Presl divides this genus into three sections, as under. 



* EUDIDYMOGLOSSUM. 



1. D. punctatura. Trichomanes punctatum. Pair. 



2. D. sphenoides. Tr. sphenoides, Kunze. Hymenophyllum guadaloupense, Spr. 



3. D. Hookeri. Tri. reptans, Hook, et Grev. Ic. Fil. t. 32. 



4. D. reptans. Tri. reptans, Siv. 



5. D. muscoides. Tri. muscoides, Sw. T. apodum. Hook. et. Grev. Ic. Fil. t. 1 17. 



6. D. Kraussii. Tri. Kraussii, Hook, et Grev. Ic. Fil. t. 149. 



7. D. quercifolium. Tri. quercifolium. Hook, et Grev. 



8. D. minutulum. Tri. miuutulum, Gaudich. 



9. D. alatum. Hymenophyllum alatum, Schkuhr, Fil. t. 1356. 



10. D. decipiens. Desv. 



11. D. Filicula. Tri. bilabiatum, Nees et Bl. Hymenoph. Filicula, Bory. 



12. D. brevipes, Presl. " D. fronde breviter stipitata oblongo-lanceolata acuta 

 pinnata, pinnis subsessilibus oblongis obtusis profunde bipinnatifidis glaberrimis, 

 infimis horizontalibus, laciniis oblongo-lanceolatis obtusis, secundariis (lacinulis) line- 

 aribus obtusis integerrimis, soris exsertis sessilibus, indusio infundibuliformi alato — 



