56 



5. Pteris longifolia L. 



According to Hieronymus (Hedwigia LIV (1914) 283-294) all 

 specimens from the Dutch East-Indies mentioned under this name 

 belong to Pt. vitttita L., Pt. longifolia being restricted to the 

 New World. Ptei is \ittata L. is a kremnophyte spread throughout 

 Java from the plains up to 2000 m., especially beneath 1200 m.; it 

 reproduces itself exclusively by spores. It chiefly occurs on old brick 

 walls, on cliffs, on steep roadsides and in stony or calcareous 

 localities. Raciborski ') calls it: ,,Eine sehr gemeine Art der Ebene 

 ,,und dcs I liigellandes, seltener im Gebirge, doch noch bis 2000 m. 

 ,,vorhanden. Besonders gerne an sonnigen Stellen, Kalkfelsen, Mauern; 

 ,,im Gerolle am Gunung Guntur bis zum Krater aufsteigend". From 

 all this it appears that in 1886 the fern found on Krakatao many fit 

 habitats; it max have occurred in many specimens. 



6. Neplirolc-pis exaltata Schott. 



Terrestrial or less often epiphytical heliophilous fern, most variable 

 as to its indumentum, producing many long stolons and consequently 

 very often growing gregariously. It does not claim a fertile soil; it 

 is often found growing in stony or rather sterile sunny, provided not 

 too dry localities. From the plains up to an altitude of 1200 m. it 

 is one of the commonest ferns of Java. Besides by stolons it repro- 

 duces itself by spores. In 1886 the lower parts of Krakatao were very 

 fit for it; it has been collected there at every excursion. The supposition 

 of I r e u b -) that, like Acrostichum aureuni L., it prefers a saline 

 substratum is quite unfounded; in such localities the plant never 

 occurs, though it may be found in the interior of old coral islands. 



7. Nephrodium calcaratum Hook. 



This plant clearly illustrates what I have said on page 8 on the 

 insufficient knowledge of the flora shown by different authors on 

 the renewal of the flora of Krakatao. Nephrodium calcaratum Hook. 

 (at present named Dryopteris calcarata O. K.) is a very shallowly 

 rooting, heliophobous, hygrophilous fern, which has been collected 

 in Java and Sumatra in several localities between 150 and 1000 m. 

 above sea-level, exclusively on very humid river banks and on wet 

 rocks in rivers, always in well-shaded localities. I he most trustworthy 



') Die Pteridophyten de-r Horn von Buitenrorg (1898), pp. 151, 152 under the nnme 

 of I'lrris lanqifalia I.. 



-) Aim. |.ird. Bot. Bnitc-nzorq VII (1KXX), ,, 2I!I. 



