130 



of these additions: by Krakatao ilir Arsin indicated the locality at 

 Zwarte Hoek, by Krakatao oedik the locality on the eastern side. 



This trip is remarkable because then for the first time the eastern 

 side of Krakatao was visited by botanists. But only the very lowest 

 parts of the mountain, which had been deeply and permanently buried 

 by the eruption of 1883 could be explored and this only hastily, the 

 higher slopes being everywhere secluded from the beach by a very 

 dense girdle of Saccharum spontaneum, which could not possibly be 

 crossed during so short a trip. None of the plants found back by 

 me in the Buitenzorg Herbarium was accompanied by any data about 

 frequency and habitat, barring the additions mentioned above. 



In the list beneath the plants mentioned by Valeton and 

 Arsin are recorded in systematic order. Of the plants found back by 

 me in the Buitenzorg Herbarium I have mentioned on which side of 

 the island they were collected. Of the rest it is unknown where 

 they were found. 



Polypodiaceae. 



/. Dryopteris unita O.K. See p. 56 under No. 7. 



2. Ncphrolepis exu/teto Schott. See p. 56, No. 6. 



Zwarte Hoek. 



3. Ceropteris calomelanos Und. See p. 54, No. 1. 



4. Qnychium si/iculosum C. C/ir. See p. 60, No. 11. 



5. Drynaria quercifolia /. Sm. See p. 113, No. 26. 



Lycopodiaceae. 



6. Lycopodium cernuum L. See p. 113, No- 29. 



Cycadaceae. 



7. Cycas rumphii Miq. 



Dioecious tree with a robust trunk, up to 2 m. high and 

 2-8 dm. 'thick*), under cultivation-) growing very slowly 



') Cf. Hasskarl in lijdschr. Ned. -Indie IV, p. 129.- in Flora (Regensb. Bot. 

 Zeitunq) 1847, p. 490 and | u n g h u h n, lava, 2 nd Dutch Edition I, 268 in ann. 

 German Ed. I, 195 in ann." 



2 ) This Cycas is in lava very often cultivated for ornamental purposes, mostly in 

 V specimens as especially the big cones of rf during the anthesis spread a strong 

 and very disagreeable odour; the smell of flowering V specimens is less strong. These 

 male cones are much frequented by pollen-collecting small bees. The artificial reprod- 

 uction is most frequently made by taking off the lateral shoots which sprout from 

 old trunks. Cultivated specimens, as a rule, produce no ripe seeds. This may be caused 

 by the comparatively rare occurrence of <^' specimens in cultivation, so that flowering 9 

 and (f specimens are but seldom found in each other's vicinity. Where both sexes are 

 growing intermixed in rather large numbers and in a wild state, as is the case here 

 and there on the southern coast of |ava, ripe seeds are frequently found. 



