1056 



Genus, Abeodictyum, Presl. 



" Venae prominulae, ramos®. VenulBe crehrs, tenuissimag, flexuosfe, in maculas 

 irregulariter oblongas anastomosantes, ramosse, veniilis secundariis pone marginem 

 longitudinaliter decurrentibus, alliis intra maculas brevibus liberis obtusis. Cellulse 

 intia maculas transverse lineari -hexagon se. Sorus exsertus, pedicellatus. Indusiura 

 infundibuliforme, limbo patente vel patentissimo integerrimo. Receptaculum indusio 

 triplo longius, setaceum, basi capsuliferum. Capsulse sessiles, lenticulares. Rhizoma 

 liueam fere crassum, breve, oblique repens, teres, fuscum, paleis piliformibus fuscis 

 vestitum, radices filiformes flexuosas simplices breves firm\ilas emittens, apice appa- 

 reuter fasciculum frondium gerens, quse vero tantum aggregate et revera sparsse sunt. 

 Stipes circiter pollicaris, filiformis, teres, glaber, basi ima hinc inde palea piliformi mi- 

 nuta adspersus. Frons (in strictissimo sensu) hygroscopica, elastica, transparens, quad- 

 ri- quinque-pollicaris, glaberrima, oblongo-lanceolata vel lineari-lanceolata, acuta, tri- 

 pinnata, apicem versus bipinnata, apice pinnata. Pinnae infimas petiolulo semilineali 

 instructse, ovats, reliquse sessiles, inferiores et medias ovato-lauceolatae bipinnatae, su- 

 periores lanceolatae pinnatse, supremae lineares integerrimas acutae. Pinnulae primariag 

 et secundarise sessiles, lineares acutae, integerrimae, semilineam latae, pallide virides (in 

 sicco). Rachis primaria inferne teres filiformis, in reliquo decursu secundariisque 

 tertiariisque foliaceo-alata. Vena in qualibet pinnula solitaria, prominula, ramosa. 

 Venulae tenuissimae, flexuosae, in maculas oblongas saepe irregulares subinde ad figuram 

 hexagonoideam accedentes anastomosantes, venulis secundariis venulam inframar- 

 ginalem longitudinaliter et undique decurrentem efEcientibus, aliis intra maculas bre- 

 vibus libere obtuse recteque desinentibus. Parenchyma e cellulis diversis constitutum, 

 cellulae marginales et spatiorum angustorum macularum sunt nempe hexagonoideo- 

 rotundatffi, spatiorum latiorum macularum sunt transversEe et lineari-hexagonoideas. 

 Sori laterales, exserti, pedicello usque fere semilineali instrucli, mediocres, pedicello 

 foliaceo-alato. Indusium infundibuliforme, utrinque anguste alato-marginatum, lim- 

 bo patente vel patentissimo integerrimo vel obsolete repando. Parenchyma indusii e 

 cellulis hexagonoideo-rotundatis constructum. Receptaculum indusio triplo longius, 

 setaceum, rectum aut flexuosum, punctis impressis spiralibus notatum, basi capsulife- 

 rum. Capsulae sessiles, lenticulares.'' — p. 21. 



1. A. Cumingii, Presl. 



For this beautiful and remarkable fern we are indebted to Mr. 

 Cuming. It was distributed under the numbers 208 and 358. The 

 description of the genus includes that of the species. 



Genus, Didymoglossum, Desvaux. 



This very distinct and beautiful genus was established seventeen 

 years ago by Desvaux, and strange to say, has been neglected by all 

 subsequent filicologists with whose works we are acquainted. It ex- 

 hibits in an eminent degree the full development of the bifid structure 

 of the limb of the involucre, a character which we believe common to 

 the whole of the Hymenophyllaceae. We find no trace of this struc- 

 ture in Presl's figure of Cephalomanes (the plant itself we have not 



