160 



perhaps rather less. Almost continously immured between two high 

 walls of Saccharum, that hid from view everything not quite near, 

 we could investigate only the flora of an exceedingly small part of 

 the lower slopes, viz. the margins of the path cut by us and a few 

 small open spots we happened to come across; we were not able 

 to reach the higher ravines which were so much more important for 

 the exploration. It is therefore quite out of the question that this 

 short trip should have given a somewhat complete survey of the 

 vegetation of the island in 1906: tens, perhaps hundreds of species 

 may have remained unobserved. If one from the fact that in subse- 

 quent years species were collected on Krakatao not seen there in 

 1906, should conclude that all these species had established themselves 

 there after that year, one would give proof of serious lack of insight 

 into problems as that in question. To tell the sad truth, the 

 botanical investigation of the interior in 1906 was a failure. For 

 this failure the investigators, who did all they could, cannot be 

 blamed, but nevertheless a failure it was. \Ve observed the following 

 plants: 



Schizophyceae. 



Bluish green algae covering pieces of pumice. Names 

 unknown. 



Bryaceae. 



/. Bryum coronatum Sc/nvaegr. 



Calciphilous '') caespitose moss, living on (mostly calcifer- 

 ous) earth, brick walls and calcareous rocks, spread from 

 West- to East-Java from the plains to an altitude of more 

 than 1000 m. 



On the lower south-eastern slopes forming tufts along the 

 borders of the gullies. 



Bartramiaceae. 



2. Philonotis secunda Van den Bosch et Lacoste. 



Moss, forming dense sods on rocks and earth, spread in 

 West-Java from the plains to an altitude of 1500 m. 



l ) For the CaO-percentage of part of the eruptive products see p. 59, sub 

 No. 9, Pteris eguilina L. This same moss was found i.a. on the calcareous rocks 

 of Kuripan near Buitenzorg. [Cf. Moritzi, Systematisches Verzeichniss der von 

 H. Zollinger in den lahren 18421844 auf Java gesammelten Pflanzen (1845 46), 

 p. 133, under the name of Br. (Jolio/um Duby}. 



