— 9 — 



tibus, apice acutis, breviter acuminatis, costa supra magis prominens, obtuse 

 lateque tetragona et lateraliter canaliculata, venis minus prominentibus, soris 

 costam attingentibus vel subattingentibus. 



Banca {Mt. Maras, H. A. B. Biiiinemeijer No. 1846). 



Asplenium carinatum, v. A. v. R. 



Thamnopteris. — Rliizoma breve, crassum, fusco-squamosum. Stipites 

 aggregati, breves, vix conspicui. Frondes relative tenues, flaccidae, glabrae, 

 lineari-oblanceolatae, 40 — 50 cm. longae, + 5 cm. latae, breviter subabrupte 

 acuminatae, integerrimae, basin versus sensim angustatae, margine leviter 

 incrassatae recurvataeque ; costa supra anguste carinata, subtus plana (vel 

 in sicco sulcata); venae graciles, patentissimae sed non horizontales, saepe 

 furcatae. Sori in dimidia parte superiore frondium, dimidiam partem inferiorem 

 venarum occupantes, costam attingentes, venis et venulis posticis venarum 

 ramosarum sterilibus separati ; indusium obscure brunneum. 



Originally determined as A. phyllitidis Don, which differs in having 

 the fronds distinctly stalked, the costa prominent on both sides, at least 

 not flattened beneath, and the sori much longer, separated by a relatively 

 narrow sterile space from the margin, not reaching the costa. 



Celebes {Maros, Teysmann No. 12791). 



Asplenium nidus, L., Spec, II, 1079; v. A. v. R., Mai Ferns, 439. 

 Supplem., 282. 



It is often difficult to make out whether a plant determined as A. 

 nidus L. is a true „nidus" or a related species, since in most herbarium 

 specimens the rhizome and stipes are totally wanting, the fronds being 

 often cut off far above the base. The few specimens of the Buitenzorg 

 Herbarium, which have still a portion of the rhizome and are labelled A. 

 nidus L., have the rhizome very short, thick, with the fronds sessile or 

 subsessile, crowded, varying from linear-lanceolate to oblanceolate, cuneate 

 or decurrent at the base, narrow to very broad, naked or sparingly and 

 very minutely eroso-squamulose beneath; the scales of the rhizome are 

 fuscous to nigrescent, with the margin fimbriated into long, setiform or 

 filiform and more or less crisped or flexuous laciniae. In typical „nidus" 

 the costa is prominent and blunt on the under side but our specimens 

 have the costa prominent on one side {either above or beneath) or on 

 both sides, rounded, quadrangular, keeled or keel-shaped. The sori, varying 

 from very short to very long, are confined to the upper part ('/a — '/a) of 

 the fronds and placed on all the simple veins and the veinlets of the 

 branched veins, rarely separated by sterile posterior veinlets. The living 

 plants have the fronds forming a humus-collecting crown- or funnel-shaped 

 nest. — It is very well possible that several of those forms may be 

 separated as distinct species from typical A. nidus but, although our 



