Eumycetes. — Pflanzenkrankheiten. 191 



Thaxter, R., Note on the ascosporic condition ol" the 

 genus Aschei'sojita Montagne. (Botanical Gazette. LVII. p. 

 308—313. 7 Fig., 1914.) 



The ascosporic condition of different species of Aschersonia was 

 found in Grenada and Trinidad. This paper contains a preliminars' 

 note on this condition in A. tiirbinata. 



The perithecial stromata in this species are less highly specia- 

 lized than they are in some of the species. The perithecia are 

 usually aggregated in more or less distinct pustules, which seem 

 to arise after the pycnidial form has practically ceased its activities. 

 Often, however, the whole stroma is perithecigerous, and no 

 P3^cnidia precede or accompany them. In some cases the perithecial 

 groups are very small. In some oiher cases almost all of the original 

 stroma is perithecigerous. 



The perithecial cavities are almost completely imbedded in this 

 stroma. They are bottle-shaped, with a relativelv narrow and well 

 defined neck and are surrounded by a more dense, thin perithecial 

 wall, the substance of which is like the similar but broader layer 

 which surrounds the neck and forms the bulk of a definite though 

 not very prominent papilla which marks the position ofthe perithecium. 

 externall}'^, and is perforated by the ostiole. 



The asci which arise from a slight cushion at the base of the 

 perithecial cavit}'-, are rather slender at maturity, tapering slightly 

 to the peculiarl}^ differentiated apex, which is modified in a fashion 

 exactly resembling that seen in the asci of Cordyceps and its allies, 

 As the asci mature, the stalk becomes more elongate and slender 

 and the eight filamentous spores, which are at first cylindrical and 

 continuous, are later divided by septa as in Cordyceps. The Segments 

 thus formed eventually separate from one another, the ascus 

 becomes fiUed with countless spores, rodlike in form, with rounded 

 ends. The spores and their segments are conspicuously vacuolate, 

 so that they present a banded appearance which gives them a 

 distinct individuality. Jongmans. 



Yonng. V. H., Succesful artificial cultures of Clitocybe 

 illudens and AvniiUana niellea. (Botanical Gazette. LVII. p. 524 — 

 526. 1914.) 



The writer obtained interesting artiticial cultures from spores 

 of Clitocybe illudens and resulting in normal fruit bodies which were 

 sporulating profusely. From these spores cultures again have been 

 obtained, with fruiting bodies, showing striking variations in form 

 from the original parent. It is suggested that slightly scorching of 

 a particular lot of medium, has been the determining factor for 

 fruiting. 



Another interesting culture was that of Armillaria mellea, which 

 resulted in light gray rhizomorphs, flat and ribbon-like, often bran- 

 ching dichotomously. M. J. Sirks (Haarlem). 



Carpenter, C. W., Some potato tuber-rots caused by spe- 

 cies of Fusarium. (Journ. Agr. Res. V. p. 183 — 210. pl. A, ß, 

 and 14—19. Nov. 1915.) 



Details of methods and experiments, with a taxonomic arran- 

 gement and description of the important rot producing species of 

 Fusarium, of which one — F. eumartii — is characterized as new. 



Trelease. 



