278 Floristik, Geographie, Systematik etc. 



IL Hydrarch successions, 



1. The bog successions. 



2. The delta swamp succession. 

 A. Secondary succession. 



The burn succession. 



The Forest is described in detail, as to the secondary trees, 

 such as mountain ash {Pyrits americana (Marsh) DC.) and a=rbor vitae 

 {Thuja occidentalis L.). The shrubby growth, which is not abundant, 

 includes greenalder {Alnus crispa (Ait. Pursh), high bush cranberry 

 {Viburnum paucißorum Raf.), red-berried elder {Sambucus raceniosa 

 L.), bush honeysuckle, {Lonicera canadensis Marsh) and devil's club 

 {Fatbia horrida Sm.) B. & H. The herbaceous plants are characte- 

 ristic of the north eastern conifer forest, such as: brench-berry 

 {Cornus canadensis L.), twin-flower {Linnaea borealis L. var. ameri- 

 cana (Forbes) Rehder), gold-thread {Coptis trifolia (L.) Salisb.). The 

 mosses are most important constituents of this forest. Calliergon 

 {Hypnum) Schreberi is the most abundant species together with 

 Hyloconiium proUfermn (L.) Linb., H. triquetrum (L.) Linb. and 

 Hypnum crista-castrensis L. 



In the study of individual species, the author discusses the 

 seedlings, reproductions by layering and growth of Abies balsamea, 

 Betula alba var. papyrifera, Picea canadensis and others. Two figu- 

 res are given of the trees of the climax forest arranged according 

 to the size of the trees. Careful quadrat studies by which a know- 

 ledge of the dynamics of the forest was gained are given with a 

 series of text figures. The extent of this type of forest, as it exists 

 outside of Isle Royale, is considered by the aid of a map of 

 North America. 



After the prelirainary discussion Cooper considers categorically 

 the various successions classified above approaching their study by 

 a description of the phj'-siographic development of the habitats. 

 Photographs and outline maps make clear the argument and a suc- 

 cessional diagram and bibliography are added at the close of the 

 paper. Harshberger. 



Evans, A. H., British species of Arctium. (Journ. Bot. LI. 604. 

 p. 113-119. 1913.) 



Four distinct British species of Arctium are recognised which 

 is in accordance with Babington's conclusions as he admitted that 

 A. tomentosum was unknown in Britain. Descriptions of the spe- 

 cies, also a list of synonymy are given. One new combination is 

 made and several new forms recognised. M. L. Green (Kew). 



Fawcatt, W. and A, B. Rendle. New plants from Jamaica. 

 II. (Journ. Bot. LI. 604. p. 123—125. 1913.) 



Some notes on certain Linnean species of Coccoloba are given 

 followed by the descriptions of three new species from Jamaica 

 viz Coccoloba Priorii, C. nigra and C. neglecta. 



M. L. Green (Kew). 



Greenamyre, H., The Composite Type on the Apache 

 National Forest. (Bull. 125. U. S. Forest Service, p. 32. 1913.) 



The buUetin describes the unusual forest type in which western 



