90 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Genus Parodiella. — F. Theiszen and H. Sydow {A7iti. MycoL, 1917, 

 15, 125-142). The genus Parodiella was based by Spegazzini on 

 Doihidea perisporiordes. He described it as a Perisporieae. The above 

 writers have amended it and have added many new species. Among 

 the forms examined they have detached a number that are not 

 Farodiellse, and among these they find new genera : Bypoplegma^ 

 Fseudoparodiay Chrysomyces and Rhizotexis. A. L. S. 



Origin and Development of the Pycnidium. — F. E. Kempton 

 [Bot. Gaz., 1919, 68, 233-61, 6 pis.). The author takes up De Bary's 

 view of a twofold origin of these structures : " symphogenous " when 

 the pycnidial primordium arises from an interwoven network of hyphae ; 

 " meristogenous " when the primordium arises from a hyphal cell or a 

 group of adjacent cells of a single hypha by continued cross and 

 longitudinal division. Species belonging to a number of genera were 

 studied chiefly by cultures from spores or hyphag. The meristogenous 

 method was found to be the most frequent, and in it there are two 

 modes of development : " simple " when the pycnidium arises from a 

 single cell or a few adjacent cells of a single hypha ; and " compound '* 

 when the cells of adjacent hyphae take part in the primordium. 



Acervuli arise, as do pycnidia. The pseudo-acervulus of Pestalozzia 

 develops first as a pycnidium, then breaks open and appears like an 

 acervulus. The different stages of growth are well illustrated. 



A. L. S. 



Development and Biology of Pycnidia. — H. Schnegg {CentraJU, 

 BakL Abt. 2, 1915, 43, 326-64, 25 figs. ; see also Ann. Mycol, 1916, 

 14, 294-5). A widely spread fungus in breweries was placed in culture, 

 and its development as a Phoma was watched. The pycnidia arose, in all 

 cases, from the conidia in the culture-media. One ostiole was usually 

 formed, but several might arise. In thirty to thirty-two hours after sow- 

 ing, the conidial development would be complete. Wort was found to 

 be the most favourable medium ; in other media the fungus gradually 

 degenerated. In the older cultures resting spores of various kinds were 

 formed. The fungus was named Phoma conidiogena. A. L. S. 



Lists of Fusaria. — H. W. Wollenweber {Ann. Mycol., 1917, 15, 

 1-56). The lists compiled by the author are mainly based on his own 

 collections and cultures. He gives first an account of his herbarium, 

 and then a note on the results arrived at. Of the 442 so-called Fusaria 

 180 are true fungus species, but 69 of these belong to other genera, 

 mostly Hyphomycetes. A number also are conidial forms of Ascomy- 

 cetes, such as Gibberella, Calonectria, Bypomyces and Nectria. The 

 relationship between the forms has been established by cultures. A 

 tabulated list is given of all these fungi now determined ; a list of the 

 Fusaria to be conserved and of those to be excluded ; a list of host 

 plants with their parasites ; and, finally, diagnoses of a new genus, 

 Neonectria, and several new species of Fusarium. A. L. S. 



Position of the Sorus in Uredineae and its Value as a Syste- 

 matic Character.— F. Grebelsky {Gentralhl. BakL, 1915, AM. 2, 43, 

 645-62, 12 figs.; see b\^o Ann. Mycol., 1916, 14, 130). The author 



