185 



Lamk. (a few scattered specimens) and Olden/andia corymbosa L, (a 

 few specimens). All these species were represented by so very few 

 specimens that they could not influence the character of the vege- 

 tation. It cannot be decided whether these ,,new species" were im- 

 ported after 1906 in the investigated locality or already occurred 

 before that time; a few young specimens of a species or other may 

 quite well have been present in 1906 but have been overlooked. 

 When Eulophia macrorrhiza is in a period of rest and bears no flowers 

 it is very inconspicuous or quite invisible. The species of Pouzolzia, 

 Ximenia, Albizzia, Erythrina and Vitex, found at Zwarte Hoek in 1908, 

 have fruits fit to be spread by water, they may have been carried 

 to Zwarte Hoek after the trip of 1906. For Ximenia, Albizzia and 

 Erythrina which were represented only by young specimens, this is not 

 improbable. It cannot at all be decided whether these species had 

 come over from another point of the island or were introduced from 

 without. The two orchids (Spathoglottis p/icata Bl. and Eulophia 

 macrorrhiza Bl.) possess very minute seeds wich can easily be spread 

 over some distance by the wind or by rain-water floating over the 

 ground, but it is not al all certain that they had come from outside 

 the island. Spathoglottis was already found in 1897 on Krakatao in 

 numerous specimens, Eulophia was found for the first time in 1908, but 

 may have grown on Krakatao long before that year, even before the 

 eruption. All investigations have been carried out so hastily and over 

 such a small part of the island, that nobody can say with certainty 

 that a species in a given year was not present. O/den/andia corymbosa 

 also can have grown long before the eruption on the rocks at Zwarte 

 Hoek, its seeds may quite well have survived the eruption. From 

 the finds at Zwarte Hoek in 1908 we may perhaps conclude that 

 the flora of this locality had grown somewhat richer since 1906, 

 but this conclusion may not be extended to the entire island. The 

 little modifications in the frequency of a few species (Nos, 10, 

 11, 30 of the list here before) are of no importance. 



On May 5th I made a trip in the northern and north-eastern parts 

 of Verlaten Eiland, on May 6th a trip on the north-eastern and 

 eastern parts of Lang Eiland. Of both islands only the lower parts 

 were visited, where a dense and rather rich vegetation (resp. 64 and 

 64 species) was found, which I shall not discuss here (See pp. 34 

 and 35). 



In the evening of May 6th I went back to the south-eastern 

 point of Krakatao, where I hoped that my companions, whom I had 



