NEW OR INTERESTING MALAYAN FERNS 12. 



by 

 CAPT. C. F^. W. K. van ALDERWERELT van f^OSENBUKGH. 



LHÏHAm 



NEW YO«X 



hotanical 



OAKOtdN 



Wlierever tlie coiitrary lias iiot beeii nientioiied tlie followiiig diajJiioses 

 were ruade afler dried material and tlie descriptions of tlie colours were 

 taken froni tlie field notes of tlie collectors. 



Regardin*^" tlie synonyms referring to Chkistensen's index Pilicuni 1 

 note tliat tlie ferns of the Buitenzorg Herbarium are novv arranged in 

 accordance with niy conception. 



Isospore Filicalcs. 



Adiantum rhizophorum Sw. Syn. 320, 422 ; V. A. V. R. Mal Ferns 324. 



Rhacliis naked or nearly so, not copiously liairy (as is sliowii in 

 HK., Spec. Fil., il, tab. LXXX A), and the indusium transversely oblong, 

 witli a tendency to become obreniform. 



A plant from Java (B e s o e k i, Mt. K e n d e n g, C. A. Backek No. 

 30737), which is seemingly a form of tliis, bas tlie central leaflets horizontal, 

 somewhat decurved, less deeply lobed, the lower leaflets deflexed, and 

 the veins not compact. 



I Adiantum suborbiculare V. A. V. R. Bull. Dép. Agr. I. N. XVIll (1908), 



11; Mal. Ferns 31; Suppléai. 1, 238. 



Also in the Riouw A r c h i p e 1 a g o : P o e 1 o e B i n t a n, Mt. 

 Bintan, on stones in forest, ait. 250 m. (H. A. B. BiiNNEMEljER No. 6167, 

 14 June 1919). 



k 



^ Adiantum flabellulatum L. Spec. 11, 1095; v. A v. R. Mal. Ferns 334.— 



A. Doctersii v. A. v. R. Bull. Btz. XI (1913), 1, tab. I; Supplem. 1, 236. 



Forma typicum : Fronds flabellate-pedate, subdichotomous. 



Forma Doctersii: Fronds pinnately branched. — United with the type 

 by intermediates. 



e«) «^ Alsophila Janseniana V, A. V. R. 



o^ Truncus usque 50 cm. vel plus altus. Stipites + 160 cin. longi, iiiermes, 

 praesertim in juventute dense squamosi, parte inferiore fusci, parte superiore 

 csi(cuni rhachide) pallidiores; squamae relative longae, lineari-lanceolatae, flavido- 

 c brunneae, nitentes, graciliter longe acuminatae, setulis spinuliformibus, bre- 

 ^vissimis, rubido-brunneis, acutis, dense ciliolatae, basibus persistentibus, 

 subverruculiformibus. Frondes lineari-lanceolatae, 4; 230 cm. longae, abrupte 



