1103 



1. M. lortuosuiu. Tiich. tortuosum, Banks, in Herb. Jacq. Hymen, tottuosum, 

 Hook, et Grev. 



This species, on which the genus is founded, was collected by Sir 

 Joseph Banks in New Zealand, and a specimen, labelled Trichoma- 

 nes tortuosum, was communicated by that illustrious naturalist to M. 

 Jacquin, and is now in the herbarium of the Imperial Museum at 

 Vienna. 



2. M ? dichotomum. Hymen, dichotomum, Cav. 



3. M. clavatum. Hymen, clavatum, Siv. 



Genus, Ptychophyllum, Presl. 



" Costa teres. Venae pinnatae, altemEe, distantes, ramosEB, venulisque apice libero 

 desinentes. Sorus in lacinia frondis terminalis, compressus, sessilis. Indusium ad 

 duas tertias partes bifidum, laciniis ovatis obtusis, altera Integra, altera bifida. Re- 

 ceptaculum lineari-cylindricum basi incrassatum nudum, apioem versus pulvinis ver- 

 inicseformibus spiraliter dispositis provisum. Capsulas lenticulares, verrucis receptaculi 

 suboblique affixae. Rhizoma repeus, filiforme, ramosum, radicibusque sparsis palea- 

 ceo-pilosum. Frons stipitata, hygroscopica, tenera, trausparens, pinnulis secundariis 

 pinnatifidis integrisque, laciniis inasqualiter acutiuscule serrulatis longitudinaliter pli- 

 catis, cagterum glaberrimis, racbibus margine foliaceo in deutes acuminatos diviso pro- 

 visis. Stipes uni- tri-poUicaris, teres, bifarie paleaceus vel potius margine frondis 

 utriusque in dentes acuminatos paleaeformibus dissolute instructus. Costae tenues, 

 prominulae, stipiteque rachibusque atro-fuscEe. Venee venulasque teres, steriles apice 

 libero desinentes. Pareucbyma e cellulis bexagonoideis constructum. Sori in superiori 

 frondis parte obvenientes, in laciniis terminales, sessiles, compresso-plani, mediocres. 

 Indusium usque ad duas tertias partes longitudinis bifidum, laciniis ovatis obtusis 

 conniventibus aequalibus altera usque ad duas tertias partes longitudinis bifida, laci- 

 niis aequalibus sinu acutiuscule divisis, altera Integra. Receptaculura indusio aquilon- 

 gum, rectiusculum, filiforme, teres, basi incrassatum inferneque cicatricibus linearibus 

 longitudinaliter spiralibus, a medio usque ad apicem pulvinis vermcceformibus crebris 

 patentissimis spiraliter ordinatis apice truncatis suborbiculatis et coloratis instructum. 

 Capsulffi in verrucis seu potius pulvinis sessiles, oblique affixae, lenticulares." — p. 29. 



1. P. plicatum. Hymen, plicatum, -flTaw//'. Hymen, ma gellanicum, WiVZtZ. Aeri. 



This species was brought from Chili by Chamisso and Cuming. 

 Presl observes that although it possesses the general habit of the Hy- 

 menophyllaceae, it is totally different in the structure of the fruit. He 

 considers that by means of the genera Leptocionium, Myrmecostylum 

 and Ptychophyllum, a complete and continuous series is formed of 

 the TrichomanoidesB and Hymenophylloideae. 



Genus, Hymenophyllum. 



" Costa teres, prominula. Venae alternae, distantes, ut plurimum ramosaa, saspius 

 utrinque pinnatae, in pinnis dimidiatis in latere inferiori deficientes, steriles venulisque 

 apice libero obtuso desinentes. Sorus in lacinia terminalis, aut suborbiculatus aut sae- 

 pissime ovalis, utrinque convexus, sessilis aut subpedicellatus. Indusium bilobum, 

 bifidum aut bipartitum, lobis laciniisve demiim patentibus. Capsulee lenticulares, ses- 



