140 Eumycetes. — Pflanzenkrankheiten. — Pteridophyten. 



Vülaresiae auf Blättern von Vülaresia Gongonha var. integrifolia . 

 Belcnioscypha hypnorutn auf Blättchen von Hypnunt cupressiforme. 

 Macrophoma Vülaresiae auf Blättern und Blattstielen von Vülaresia 

 Gongonha. Ascochyta Bornmülleri auf Blättern von Phaseolus acuti- 

 folius. Cladosporium Hoveae auf Blättern von Hovea longifolia Br. 

 var. pannosa Benth. Rippel (Breslau). 



Doggar, B. M., The Texas Root Rot fungus and its coni- 

 dial stage. (Ann. Missouri Bot. Garden. III. p. 11—24. 5 Fig. 1916.) 



This important cottou disease has originally been described as 

 Osoniuni omnivorum Shear. The fungus lives on a large number of 

 hosts, The author brings the description of the life history of the 

 fungus. In connection with the Osoniuni condition the conidial stage 

 was found. Therefore the plant has been tentatively placed in the 

 genus Phyniatotrichiim and is redescribed as P. omnivorum (Shear 

 Duggar n. comb. Jongmans. 



Gilman, J. C, Cabbage Yellows and the relation oftem- 

 perature to its occurrence. (Ann. Missouri Bot. Garden. III 

 p. 25—84. 21 Fig. 2 Fl. 1916.) 



Cabbage yellows is a wilt disease of cabbage caused by Fusa- 

 rium conglutinans Wollen w. 



The fungus is a facultative parasite living in the soil, from 

 which, under certain conditions, it becomes destructive to cabbage 



The fungus has a high Optimum temperature and is very resis- 

 tant to drying— both in pure culture and in the soil. 



Inoculation experiments with Fusarium conglutinans in pure 

 culture caused the disease in a large percentage of the trials. Con- 

 trol plants remained entirely free from the yellows. Fusarium con- 

 glutinans was recovered from inoculated diseased seedlings and 

 again produced the disease upon inoculation. 



Variation in virulence of the cultures and in susceptibility of 

 the host caused many artificial inoculations to be unsuccessful. 

 resulting in less than 100 per cent infection. 



Mechanical or chemical injury to the stem of the host caused 

 wilting, but neither yellowing nor dropping of the leaves such as 

 is found in diseased seedlings. 



The characteristic Symptoms are dependent on a temperature 

 of about 17 — 22° C. or above for their occurrence. Lower tempera- 

 tures (12 — 16° C.) under controlled conditions prevented the occur- 

 rence of the trouble in the green house. 



Observations made in the field during the summers of 1912, 

 1913 and 1914 bore out this relations between the occurrence of 

 the disease and high temperature. Jongmans. 



Wherry, E. T., A chemical study of the habitat of the 

 Walking fern, Camptosorus rhisophyllus (L.) Link. (Journ. 

 Washington Acad. Sc. VI. p. 672—679. 1916.) 



It has been shown by chemical analysis that the rocks suppor- 

 ting the growth of Walking fern {Camptosorus rhisophyllus) are by 

 no means necessarily calcareous, but that the soils in which this 

 fern grows are rather high in both total and soluble lime. Rocks 

 high in lime suffer leaching during soil formation, and those low 

 in this constituent gain it through decay of vegetable matter, the 



