113 



26. Drynaria quercifolia /. Sm- (Polypodium quercifolium L). 



This is the well-known ,,oak-leaf fern" of the plains, which 

 generally grows as an epiphyte on tree-trunks and heavy 

 branches but sometimes also on rocks and steep banks. 

 Closely allied to this species and united to it by intermediate 

 forms is Drynaria sparsisora Moore (= Polypodium Linnaei 

 Bory), which had perhaps better be regarded as a form of 

 Dr. quercifolia and which, according to Raciborski 1 ), 

 in 1897 occurred plentifully on Krakatao. A specimen 

 collected there on the excursion of that year is present in 

 the Buitenzorg Herbarium. 



Habitat and frequency not mentioned by Penzig. 



27. Acrostic/wm aureum L. See p. 55, No. 4. 



As habitat of this species Penzig mentions but without 

 any doubt wrongly steep rock-sides in the interior; he names 

 it together with No. 22, Ceropteris calome/anos Und. Whoever 

 has but a slight knowledge of the Javanese fern-flora knows 

 that these two species the first a halo-hygrophyte, the second 

 a kremnophyte never grow together. R a c i b o r s k i -) 

 records Acrostichum aureum L. as occurring on Krakatao but 

 says nothing about its habitat and frequency there. 



Ophioglossaceae. 



28. Ophioglossum reticulatum L. sensu lato (O. moluccanum 



Schlecht.). See p. 109. 



This little fern reproduces itself as well by spores as by 

 buds developing on the roots. Penzig and his companions 

 found in 1897 numerous young specimens. 



Lycopodiaceae. 



29. Lycopodium cernuum L. 



Club-moss spread throughout Java between 30 and 2200 m. 

 above sea-level, except in regions where the east-monsoon 

 is strong. It grows in sunny or moderately shadowed locali- 

 ties and is a typical kremnophyte growing by preference on 

 unfertile soils, very often on the steep sides of hollow roads, 

 terraces, ravines and of the small dams which in Java so 

 very often border the roads. This species found in 1897 and 



1 ) Raciborski, Die Pteridophyten der Flora von Buitenzorg (1898), p. 118. 



2 ) Raciborski, Die Pteridophyten der Flora von Buitenzorg (1898), pp. 50, 51. 



