Pflanzenkrankheiten. — Pteridophyten. — Floristik etc. 127 



Petch, T., Cacao and Hevea Canker. (Circ. Agric. Journ. Royal 

 Bot. Gard. V. 13. p. 143-180. Ceylon 1910.) 



An account is given of Carruthers' investigations on Cacao 

 canker and the results of more recent workers are also summarised. 

 Inoculation experiments indicate that the pod disease and stem 

 canker of Cacao are identical, both being caused by the fungus 

 Phytophthora. Hevea canker was attributed by Carruthers to 

 Nectria, but more recent experiments demonstrate the harmless 

 nature of the common Nectria on dead Hevea. Various fungi were 

 obtained from cankered Hevea and Cacao, and inoculations were 

 carried out with them, with the result that the Phytophthora was 

 proved to be the causative agent of canker in both plants. Several 

 other fungi constantly occur sapropl^tically on both these trees. 



The canker fungus, Phytophthora Faberi, forms a mycelium 

 which produces sporangia giving rise to a number of zoospores. In 

 addition thick walled oospores are produced. 



The Symptoms of the canker disease are described and also 

 methods of treatment, excision and removal of diseased tissue being 

 commonly practised. Spraying with Bordeaux mixture is effective 

 but expensive. W. E. Brenchley. 



Petch, T., Root Diseases of Tea. (Circ. Agric. Journ. Royal 

 Bot. Gard. V. 11. p. 95—114. Ceylon 1910.) 



Tea plants are subject to root diseases caused by the attacks of 

 various fungi, some of which produce an external mycelium on the 

 root, while others do not show this. External mycelium is present 

 when the root disease is caused by: 



1. Hymenochoete noxia. 2. Poria hypolateritia. 3. Rosellinia 

 bothrina. 



No external mycelium is visible with: 



1. Ustulina sonata. 2. Botryodiplodia theobromae. 



A general description of these diseases is given, attention being 

 particularly directed to the points of difference and also to the best 

 methods of eradication in each case. References are given to other 

 accounts of the fungi. The diseases are treated practically rather 

 than technically. W. E. Brenchley. 



Fomin, A., Dva novich paporotnika s Kavkaza. [Ueber zwei 

 neue Farne aus dem Kaukasus]. (Moniteur Jard. bot. Tiflis. 

 18. 1910. p. 20-23. Mit 1 Tafel. Tiflis 1911.) 



1. Dryopteris oreades Fomin n. sp. wächst in der subalpinen und 

 alpinen Region des Kaukasus (5500- 7500!) 



2. Polystichnm Wororiowii Fomin n. sp. ist verbreitet im Ab- 

 chasia (prov. Suchum), in der Provinz Batum bis zur persischen 

 Grenze. Wird abgebildet und die Unterschiede gegen P. angidare 

 angegeben. Die Diagnosen sind in lateinischer Sprache verfasst. 



Matouschek (Wien). 



Abrams, L. R., The Monard ellas of Southern California. 

 I. (Muhlenbergia. VIII. p. 2b— 36. Mar. 30. 1912). 



Contains as new: Monardella macrantha Hallii, M. macrantha 

 longiloba (M. macrantha tenuiflora Hall), M. nana leptosiphon (M. 

 villosa leptosiphon Torr.), M. nana tenuiflora (M. tenuiflora Wats.), 

 M. nana arida {M. macrantha arida Hall), M. cinerea, M. australis 

 and M. epilobioides erecta. Trelease. 



