Algae. — Eumycetes. 169 



and further Gloiosiphonia capillaris, of which tetraspore-bearing 

 plants have not been met witli at the shores of Denmark (only 

 known from the coasts of Norway and Sweden). On the other 

 band there are species which only propagate by tetraspores, not 

 sexually: Hüdenbrandia , all species; Cruoriopsis gracilis a. o.; in 

 these, tetraspore formation must be supposed to take place without 

 reduction of chromosomes. 



Parthenogenesis has been shown with certainty in Platoma 

 Bairdii by Kuckuck. Some observations would seem to suggest 

 that it may also occur in other Cyyptonemiales {Fuvcellaria fasti- 

 giata, Petroselis Kennedyi). In Petrocelis Kennedyi and Cruoria 

 pellita, tetraspores and sexual organs have been met with in one 

 and the same individual. In all these cases it must be presumed 

 that the tetrasporangia are formed without reduction of chromo- 

 somes. 



Finally, the author opposes against Svedelius' Suggestion 

 that the cruciate tetrasporangia might possibly always be produced 

 without reduction of the chromosomes. L. Kolderup Rosenvinge. 



Duggar, B. M., Rhisoctonia solani in relation to the „Mopo- 

 pilz" and the „ Vermehrungspilz "= (Annais Missouri ßotan. 

 Garden. III. p. 1 — 10. 1916.) 



From the reviews and discussions it seems justifiable to the 

 author to conclude that the common seedbed fungus in Germany 

 and in France is identical with the damping off fungus which has 

 been frequently studied in the United States. The damping off 

 fungus is Kühn 's Rhisoctonia solani [Corticiuni vagum B. et C.i. 

 The work of Rant enables us to include in the category of diseases 

 due to Rhisoctonia solani the disease of Cinchona seedlings and of 

 other plants in Java (Mopopilz). Jongmans. 



Jaap, O., Weitere Beiträge zur Pilzflora der Schweiz. 

 (Annal. Mycolog. XV. p. 97—124. 1917.) 



An neuen Arten und Varietäten werden beschrieben : Belo- 

 nidium cirsiicola Jaap n. sp. auf faulenden Stengeln von Civsiuni 

 spinosissimiim. Lophoderrniutn arundinaceutn var. junciniim auf 

 dürren Halmen von Juncus Jaquinii. Mycosphaevella alnobetulae 

 Jaap n. sp. auf, dürren vorjährigen Blättern von Alnus alnobetula. 

 M. salvatoreensis Jaap n. sp. auf dürren, vorjährigen Blättern von 

 Helleborus viridis. Pleospora lantanae Jaap n. sp. auf dürren Zwei- 

 gen von Viburnum lantana. Melanconis alnicola Jaap n. sp. aui 

 dürren Zweigen von Alnus incana. Phyllosticta aspleni Jaap n. sp. 

 auf. lebenden Blättern von Asplenum riita niuraria. Ph. botrychii 

 (Jacz.) Jaap n. var. helvetica Jaap in bräunlichen Flecken lebender 

 Blätter von Botvychiunt lunaria. Phoma cirsiicola Jaap n. sp. aut 

 faulenden vorjährigen Stengeln von Cirsiuni spinosissinium. Septo- 

 ria primulae latifoliae Jaap n. sp. auf lebenden und absterbenden 

 Blättern von Priniula latifolia. Ranmlaria scabiosae Jaap n. sp, auf 

 lebenden Blättern von Scabiosa lucida. Gyroceras resinae Jaap n. 

 sp. auf altem Harz von Picea excelsa. Sc'lerotiunt alpinitm Jaap n. 

 sp. auf faulenden Stengeln von Cirsium spinosissimurn , ferner als 

 neue Art erwähnt, aber nicht beschrieben : Ramiilaria aspleni und 

 R. delphinii. Rippel (Breslau). 



