444 Pflanzenkrankheiten. — Lichenes. — Floristik etc. 



removal of the lateral branches in succession at the times when 

 they would soon die naturall5^ To avoid as far as possible the 

 danger of wound infection, such pruning should be done during 

 dry weather in the winter, and the branches burned. 



E. M. Wakefield (Kew). 



Merrill, E. K., New and otherwise interesting Lichens 

 from Vancouver Island and the Rocky Mountains. 

 (Ottawa Natural. XXVII. 9. p. 117-121. 1913.) 



The following new species are described: Lecandra {Callopisma) 

 atvosanguinea, Phlyctis speirea, Biatora Cohimbiana, Xylographa 

 niicrogvapha. The new combination Biatora {Bilimbia) syncornista 

 (Flk.) is also formed, and notes on other species given. 



Ö. V. Darbishire. 



Poulton, E. M., The Structure and Life history oi Vemicaria 

 niargacea Wahl., an Aquatic Liehen, (Ann. Bot. XXVIII. 

 p. 241—249. April 1914.) 



The structure of the thallus and reproductive organs of this 

 aquatic liehen were examined. The author states that three types 

 ot thallus structure were observed, as follows: 1) the algae disposed 

 singly throughout the colourless fungal network (in young thalli), 

 2) the algae in the form of short chains at right angles to the surface 

 and uniformly distributed-homoiomerous (in older thalli), and 3) the 

 algae aggregated near the dorsal and ventral surfaces-approaching 

 the heteromerous type. The spores often germinate within the peri- 

 thecium, and the resulting hyphal network is eventually expelled 

 through the ostiole, Short notes on cultures and on the systematic 

 Position of the liehen are given. O. V. Darbishire. 



Harpep, R. M. A Superficial Study of the Pine- Barren 

 Vegetation of Mississippi. (Bull. Torr. Bot. Club. XLI. p. 

 551—567. Nov. 1914.) 



The pine-barrens of Piniis palustris are described as found in 

 Mississippi on the noii-calcareous deposits of late tertiary age. 

 The previous literature and itinerary are given, as well, as the 

 physical features (soils topography, hydrography, and climate). The 

 plants of this type of Vegetation are listed under the heads of trees, 

 shrubs and herbs, with their habitats. The author finds that 55.3 

 per Cent of the trees and 68.4 per cent of the shrubs are evergreen. 

 Comparisons are made with other pine-barren regions and more 

 noteworthy species are listed. Harshberger. 



Harper, R. M., Geography and Vegetation of Northern 

 Florida. (6th Ann. Rep. Florida State Geol. Survey. p. 163 — 437. 

 50 figs. including a map. 1914.) 



This detailed account gives the scope of the rapports, the geo- 

 graphica! signilicance of Vegetation, the methods of quantitative 

 analysis of Vegetation by way of an introduction, as well, as a plan 

 of regional descriptions under the captions: relerence to previous 

 literature and illustrations, location and area, geology and soils, 

 topography and hydrography, climate, Vegetation types (frequency 



