190 Floristik, Geographie, Systematik etc. 



Martelli, U., „Pandanus". Nuove specie. Manipolo IL 

 (Webbia, Vol. II, p. 423—439. 1907.) 



L'auteur decrit les espfeces nouvelles suivantes du genre Pan- 

 danus, P. inaxhnns Martelli de l'ile Grande (Comores); P. Macfar- 

 /<7;/6'/ Martelli, P. DyalletianusMarieWi etP. tahitensis Martelli de Tahiti; 

 P. politus Martelli, P. calostignia Martelli, P. tuhaiensis Martelli et 

 P. hrachycarpiis Martelli, de l'ileTulenai (^o\yn€^\^)\P.raivavaensis 

 Martelli, de l'tle Raivavae Archipel Tulenai (Polynesie); P.Balenii 

 Martelli et P. Julianettii Martelli de la Nouvelle Guinee; P.bipyra- 

 midatus Martelli, P. bnerinensis Martelli, P. macrophyllus Martelli, 

 P. RoUotii Martelli et P. platyphyllns Martelli de Madagascar; P. 

 Unwinii Martelli du Niger meridional, P. Siunatramis Martelli de 

 Sumatra; P. Tischerianiis Martelli et rhopalocarpiis Martelli patrie 

 inconnue. R. Pampanini. 



Oliver, F. W., An Experiment in Co-operative Field-work 

 in Botany. (Trans, of South-Eastern Union of Scientific Societies. 

 1907.) 



An address to a congress of Natural History Societies pointing 

 on the unfruitfulness of isolated botanical excursions, and advoca- 

 ting the need for concentrating attention 3^ear after year upon a 

 limited area of Vegetation; it is further urged that co-operation of 

 observers is much more likely to produce important results than the 

 efforts of the isolated worker. The author's own experience as leader 

 of a co-operative investigation on Salt-marsh Vegetation at Bouche 

 d'Erquy in Brittany enables him to support his suggestions from 

 experience. The progress of this investigation is briefly outlined: 

 the charting of the Vegetation, the influence of rainfall and of soil- 

 salinity, and the process of marsh-building; the whole is a concise 

 account of the work at Erquy, already reviewed here. Excellent 

 photographs of the Bouche d'Erquy are given. W. G Smith. 



Oliver, F. W., The Bouche d'Erquy in 1907. (New Phytologist, 

 VI, Nov. 1907.) 



The methods employed in this investigation of Salt marsh Vege- 

 tation are yielding important results (Bd. Cent. 98, p. 523 and 551; 

 104, p. 382). Under the title "chromatic instability" the colour vari- 

 ations of Salicornia and Siiaeda are summarised. In 1904 and 1905 

 Salicovnia herhacea formed masses distinguished by their crimson 

 colour from certain apple-green Salicornia depressions and Channels. 

 In 1906, on the sarae stations, these definite colours were replaced 

 by mixed and intermediate hues; 1907 showed a partial return to 

 the differentiated shades. An analogous change was noted in 

 the case of purple and green Suaeda. A series of transplantations 

 was made to test whether the colour-forms bred true from seed; 

 in 1907 there was evidence that sods of apple-green Salicor)iica trans- 

 planted into a matrix of crimson plants had introduced the apple- 

 green form. The introduction of soil alone from apple-green to 

 crimson and vice versa had no influence. 



Marhs-building has been traced by comparing the vegetation- 

 charts prepared in 1903—4 with later j^ears. Evidence has been 

 obtained that the Vegetation is changing, that development is pro- 

 gressive, and that there is a definite succession in the vegetation- 

 covering. Where the Vegetation abuts on bare shifting sands, Sali- 



