152 Fungi, Bacteria und Pathologie. 



gegebenen Exsiccaten, soweit sie zur Gattung Puccinia gehören, werden 

 revidirt. Neu sind die Arten: Puccinia rige/isis auf Ostericnm palustre 

 (mit Uredosporen und glatten oder fast glatten Teleutosporen) und 

 P. Spicae venti auf Apera Spicae venti (Uredo mit Paraphysen). 



W. Tranzschel. 



BUCHOLTZ, Fedor, Nachträgliche Bemerkungen zur Ver- 

 breitung der Fungi hypogaei in Russland. (Bull, des 

 Natur, de Moscou. 1904. No. 4. p. 335—343.) 



Nach Erscheinen der Arbeit des Verf. „Beiträge zur Morphologie 

 und Systematik der Hypogaeen, nebst Beschreibung aller bis jetzt in 

 Russland angetroffenen Arten" (Riga 1902) erhielt Verf. oder sammelte 

 selbst in Russland zahlreiche Hypogaeen, von denen Hysterangiiun 

 stoloniferuin Tul. und Hyinenogaster citriiia Vitt. für Russland neu 

 sind. Von 16 anderen Hypogaeen werden neue Fundorte angegeben. 

 Hydnotrya carnea Corda wird zu H. Tulasnei Berk. et Br. sp. coli, als 

 f. carnea gestellt, und ausserdem noch eine f. intermedia derselben 

 Collectiv-Art beschrieben. W. Tranzschel. 



Buller, A. H. Reginald, The reactions ofthe Fruit-Bodies 

 o f Lentinus lepideiis Fr. to external Stimuli. (Annais of 

 Botany. Vol. XIX. july 1905. p. 427—436. 3 plates.) 



Lentinus is a tree iungus, a member of the Agaricini. 

 For experimental purposes the material was obtained from rotten 

 paving blocks. 



The papillae on which the fruiting bodies arise are formed 

 independently of light, but the presence of sufficient Illumination 

 is required for the production of a pileus. The papillae are not 

 somatropic so far as the wood substratum is concerned, but 

 grow out perpendicularly to the surface of the mycelial layer 

 on which they deveiop. 



Before the development of the pileus the stipe is perfectly 

 indifferent to geotropic Stimuli. In the absence of light it is 

 rectipetal, and in its presence positively heliotropic. Whilst the 

 pileus is developing, the stipe alters its reactions to external 

 Stimuli. It becomes negatively geotropic and ceases to be he- 

 liotropic. 



The gills as they deveiop become strongly positively geo- 

 tropic and can alter their direction of growth, so as to bring 

 themselves into vertical planes. 



Fruit bodies grown in weak light are often abnormal, and 

 form branches which spring from the abnormal pilei. 



Agaricus campestris compared with Lentinus offers some 

 striking contrasts. In sunny fields or dark cellars its growth 

 is normal, it is therefore apparently controlled by the Stimulus 

 of gravity and is practically unaffected by light. The author 

 suggests that as Lentinus is a tree fungus the orientation of its 

 substratum is indefinite and it may be in any position whatever 

 with regard to the fruit bodies. In order that the latter may 

 be brought into the open air, they are provided with the power 

 of reacting to the Stimulus of light, as well as to the Stimulus 

 of gravity. A. D. Cotton (Kew). 



