58 Floristik, Geographie, Systematik etc. 



affect the distribulion of dominant trees although it influences cer- 

 tain species of the ground-vegetation. Soil is the greatest differentia- 

 ting factor and iniluences the distribution of woodlands through 

 ditferences in mineral-content, water-content, and humus-content. 



The grouping of English woodlands is the maine theme of the 

 paper; it is based not merely on the dominant trees, but also gives 

 a prominent place to the lower layers of plants and takes into 

 account the soil-factors. For each type of wood details are given as 

 to distribution. composition and ecological factors; these details 

 ought to be consulted in the original paper. The relationship of the 

 types is indicated here from the summary supplied by the authors, 

 and in the paper this is supplemented by a diagrammatic scheme. 

 I. Alder Willow Series: on very wet soils. 



IL Oak and Sirch Series: on non-calcareous soils. 



A. Oak wood associations: on non-peaty soils at low and 

 moderate elevations. 



a, Damp Oakwoods: on clays, shales, loams, fine sand and 

 moist soils generall3^ 



(Derived artificial type: Oak-hazel copse). 



b. Dry Oakwoods: on sandstones, grits, sands, and dry soils 

 generally. 



B. Oak-birch-heath association: on dry coarse sand}^ and 

 dry peaty soils (low elevations). 



C. Birchwood association: on non-calcareous soils at high 

 elevations (from 300 metres to the uppcr wood limit on the Pennines). 



III. Beech and Ash Series: on calcareous soils. 



A. Ash-oakwood association: on calcareous clays, marls, 

 impure limestones, and calcareous sandstones. 



B. Ashwood association: on limestones. 



Ash-birchwood: on limestones at high elevations. 



C. Beechwood association: on Chalk in the south-cast of 

 England, with a western extension on the Oolites of the Cots- 

 wold Hills. W. G. Smith. 



Nova Guinea. Resultats de l'expedition scientifique 

 neerlandaise ä la Nouvelle-Guinee en 1907 sous les 

 auspices du Dr. H. A. Lorentz. Bot. VIII. 2. (Leide, E. J. 

 Brill. 1910.y 



1. J. J. Smith, Euphorbioceae. I.e. p. 221—245. Taf. LH— LX. 

 Neue Arten und Varietäten: Glochidion decorum, Taf. LH, G. 



ohsciiriim (W.) Hk. var. papiianum, G. glabvian, Taf. LIIl, Breynia 

 ovalifolia, Taf. LIV, B. rumpens, Baccatirea plurüocularis, Taf. LV, 

 A)itidesma contractmn, Taf. LVI, A. obovatum,< Taf. LVII, Claoxylon 

 cuneatum, TaL LVIII, C. tumidmn, TaL LIX, Macarans;a hispida 

 (Bl.) Müll. Arg. var. papuana, M. riparia Engl, mit neuer Diagnose, 

 M. cucullula, Taf. LX, M. tanariu", (L.) Müll. Arg. var. abbreviata, 

 Homalanthus nova-guineetisis Seh. et Laut, mit neuer Diagnose. 



2. A. Engler und K. Krause, Avaceae. I.e. p. 247—252. 



Neue Arten: Pothos Versteegii Engl., Raphidophora Versteegii 

 Engl, et Kr., R. Weritii Engl, et Kr., Cyrtosperma giganteum Engl,, 

 Homalonema Versteegii Engl., Diandriella Engl. nov. gen,, D. novo- 

 guineensis Engl., Cryptocoryrie Versteegii Engl. 



3. Ch. Bernard, Algues d'eau douce. I.e. p. 253—270, Taf. 

 LXI, LXII. 



Die Arbeit enthält viele neue Arten und Varietäten sowie Ab- 



