Floristik, Geographie, Systematik etc. 505 



sentieren wahrscheinlich jüngere, an das härtere Klima späterer 

 Perioden angepaste Entwicklungsstadien; sie sind höher differenziert 

 als die Aeroxylen und umfassen eine grössere Anzahl Typen von 

 verschiedenen Stufen der VervoUkommung. 



Grevillius (Kempen a. Rh.). 



Moore, Spencer le M., Alabastra diversa. Part XX V, (Journ. Bot. 

 LH. p. 332-337. Dec. 1914.) 



The author describes the following new species: Erlangen Ro- 

 gersii (Congo), E. schebellensis (E. Abyssinea), Vernonia orgyalis 

 (Angola), V. Hierniana (Angola), Acalypha Forbesn {Feru), Asclepias 

 vivni.is (Angola). E. M. Jesson (Kew). 



Pegg, E. J., An Ecological Study ofSomeNewZealand 

 Sand-dune Plauts. (Trans. N. Zealand Inst. XLVI. p. 150-177. 

 7 figs. 1914.) 



The sand-dunes observed are near Canterbury (N. Z.), the 

 topography and ecological factors are outlined, and a list of species 

 is given. Seventeen indigenous species from representalive natural 

 Orders were selected, for each there is a description of the habitat, 

 the growth-habit, and from a detailed study of the leaf-anatomy 

 conciusions are drawn as to xerophytic characterislics The illustra- 

 tions refer to growth-forms of Epilobium Bülordierianum, and to 

 leaf-anatomy oi Gunnera arenaria. Craiitsia lineata, Coprosnia acerosa, 

 and Cassinis fulvida. The author's general conciusions note that 

 while the majority of species are strongly xerophytic in habit and 

 anatomy, some true dune-plants are mesophyiic in structurc. A 

 xerophytic growth-form (e. g. Pimelea arenaria, Calystegia SoldaneUa) 

 may have mesophytic leaf anatomy. Species which grow in moister 

 dune-hollows (e. g. Carex pumila) may be strongly xerophytic. A 

 füll list of New Zealand literature on ecology is given. 



W. G. Smith. 



Pearson, G. A., The Röle of Aspen in the Reforestation 

 of Mountain Burns in Arizona and New Mexico. (The 

 Plant World XVII. p. 249-260. Sept. 1914.) 



The greater portion of the burns have grown up to quaking 

 aspen Popnlus trenmloides. Scattering trees of the original forest 

 usually remain, and where this condition exists, or where the burn 

 is comparatively small, conifers are generall}'^ restocking the land. 

 Douglas fir, white fir and Engelmann spruce thrive in the shade 

 of the aspen and eventually overtop it, reestablishing the original 

 association or forest type. On burned areas not occupied by aspen, 

 or oak brush, coniferous reproduction is usually deficient. The 

 paper gives measurement of the physical factors, such as: soil 

 moisture, wind movement, evaporation (by Piche evaporimeter). 

 The results are tabulated and conciusions are drawn from such 

 experiments. Harshberger. 



Poeverlein, H., Neue Beiträge zur Flora der Pfalz. (Mitt. 

 bayer. bot. Gesellsch. zur Erforschung heim. Flora. III. 6. p. 131 — 

 133. München, 1914.) 



Es handelt sich um Nachträge zum I. Teile. Im Ganzen sind 



