Fungi, Bacteria und Pathologie. 339 



und Conidien) werden wahrscheinlich nicht durch trockenen Luftzug, 

 sondern durch feuchten Regenwind verbreitet. Es gelang auf künst- 

 lichen Nährböden durch Aussaat von Ascosporen Conidienlager zu 

 erziehen. Bildung von Apothecien wurde auf künstlichem Nähr- 

 substrat nicht beobachtet. 



II. Über das Auftreten von Pestalozzia hartigii von Tu b. 

 auf jungen Roterlen. 



An dieser Pflanze ist der genannte, die bekannte Einschnürungs- 

 krankheit verursachende Pilz bisher noch nicht beobachtet worden. 

 Entsprechend ihrer grossen Neigung Adventivwurzeln zu bilden, 

 dürfte der Erle diese Krankheit weniger verhängnisvoll werden als 

 z. B. den jungen Nadelbäumen. In der Tat entstehen aus der ober- 

 halb der Einschnürung befindlichen Anschwellung der Axe zahl- 

 reiche Adventivwurzeln. Auch dieser Pilz kann leicht auf künst- 

 lichem Nährboden zur Conidienbildung gebracht werden. 



Neger (Tharandt). 



Parkin, John, Fungi parasitic upon Scale-Insects (Coccidae 



and Aleiiriodidae) : a general account with special refe- 



rence to Ceylon forms. (Annais Roy. Bot. Gardens Pera- 



deniya Ceylon. Vol. III. March 1906. p. 11—76. 4 plates.) 



The paper represents a summary of our knowledge of the sub- 



ject, but also contains a description of a quantity of Ceylon ma- 



terial of entomogenous fungi that has been worked out by the author. 



The writer begins with an historical sketch, after which he gives 



a systematic account of the various fungi which are associated with 



Scale insects, and concludes with general considerations on the bio- 



logical Problems presented by the study. 



The main results are as follows. Fungi growing upon scale insects 

 are widely spread and are especially common in the tropics. Most 

 forms are undoubtedly parasitic, or at least they are the direct cause 

 of the death of the insect; but the parasitism does not appear to 

 be of a very spezialized kind. All the different forms of fungi so 

 far discovered on scale insects may be ranked as Ascotnycetes, 

 though the ascus stage of many is unknown ; the Hypocreales are 

 largely represented, the commonest genera being, Nectria, Ascher- 

 sonia, Cephalosporium and Microcera. The genus Aschersoriia though 

 generally regarded as a leaf fungus is probably largely entomo- 

 genous, its entomogenous nature has been overlooked owing to cer- 

 tain Scale insects fixing themselves below the outer bark of the 

 stems. Most of the fungi grow well in artificial cultures but inocu- 

 lation experiments did not yield good results: the conditions for 

 successful inoculation are still somewhat obscure. 



As to their economic importance a moist climate is advantageous 

 for their rapid spread, but before recommending such fungi as a re- 

 medy for certain scale-pests, the author states it would be wise to 

 learn more of their habits and capabilities, as many of their near 

 allies are dangerous parasites on plants. A. D. Cotton (Kew). 



Petch, T., Descriptions of New Ceylon Fungi. (Annais 

 Royal Botanic Gardens Peradeniya Ceylon. Vol. III. Part I. 

 March 1906. p. 1—10.) 



In this list there are twelve new species of fungi which occur 

 on Hevea hrasiliensis (ten of which appear to be parasitic) and five 



22* 



