- 28 - 



The sori are, as the few ones of the still young plant show, short 

 and unila'eral, placed on the posterior side of the costulae. The reference 

 to H. brachystachys is, in spite of the very peculiar shape of the six fronds 

 which are all alike in the specimen found, unmistakable, seeing the creeping 

 rhizome, the articulated sessile fronds, the protection of the young sori by 

 the partially recurved edge of the laciniae and the long-stalked peltate 

 scales scattered among the capsules. 



if this very pretty variety proves to be a constant one, it is a valuable 

 acquisition for our room- or green-house-flora. 



Hymenophyllum rufifolium, v. A. V.R. 



Leptocionium. — Rhizoma longe repens, parce pilosum. Stipites remoti, 

 filiformes, 1 — 3 cm. longi, cum rachide pilosi, demum glabri. Frondes 

 oblanceolatae, 3 — 5 cm. longae, 1 — '/a cm. latae, rachide non vel in parte 

 superiore solum alata. Pinnae tenues, glabrae, in sicco rufae, ascendentes, latere 

 anteriore furcatae vel parce et profunde pinnatifidae, inferiores sessiles 

 vel breviter petiolulatae, superiores adnatae, basibus decurrentibus hinc 

 inde connatae. Segmenta obliqua, usque ad 6 mm. longa, simplicia vel 

 furcata, ultima '/s — 1 nun- la^a» apice obtusa, marginibus remote serrata, ser- 

 raturis obliquis, elongatis. Sori in pinnis superioribus axillares, ad segmenta 

 abbreviata et saepe contracta terminales; indusium obovatum, proportione 

 angustum, + usque ad medium incisum, basi acute obconicum, gibbis 

 glanduliformibus, vix perspicuis saepe munitum, valvis margine exteriore 

 rotundatis et fimbriato-dentatis ; receptaculum exsertum, fragile. 



Sumatra (Mt. Talamau, H. A. B. Bünnemeijer No. 925). 



Hymenophyllum rufifrons, v.A.v.R. 



Leptocionium. — Rhxzomdi repens, gracile, parce longe pilosum. Stipites 

 sparsi, + 1 — 3 cm. longi, subfiliformes; cum rachidibus costis costulisque 

 parce ferrugineo-pilosi, Frondes lineari-oblongae vel -lanceolatae, T'/a — 15 

 cm. longae, 2 — 4 cm. latae; rachis primaria inter pinnas (2—3 inferiores 

 exceptas) alata. Pinnae firmiter membranaceae, glabrae vel ad venas par- 

 cissime pilosae, in sicco rufae, obliquae, confertae vel imbricatae, usque 

 ad alam latam in pinnulas simplices, furcatas vel parce pinnatifidas incisae. 

 Segmenta ultima '/a — 5 mm. longa, + 1 mm. lata, obtusa, remote serrul- 

 ata, serraturis obliquis, brevibus et rectis vel pauUo elongatis et leviter 

 hamatis; venae 1 in segmentis ultimis. Sori saepe ad basin anticam pinnul- 

 arum solitarii, segmentos abbreviatos terminantes; indusium + Va basin 

 versus 2-valve, basi acuta, anguste alata, extus minutissime glandulosa, valvis 

 triangulari-oblongis, apice obtuso gracillime eroso-serrulatis; receptaculum 

 exsertum, fragile. 



Very near H. serrulatum C. Chr. 



Sumatra (Bengkoelen, Lebong Simpang, C.J. Brooks No. 295/S). 



