Pflanzenkrankheiten. 171 



abundance. It proved to be a species of Phytophthora and is named 

 P. erythroseptica. One ol" thc most marked external features is the 

 pink coloration exhibited by the diseased tuber when cut open and 

 exposed to the air; hence the designation ''Pink Rot". The develop- 

 raent of the sexual organs and oogonia is so diverse from that of 

 the well-known P. otniiivora, that a re-examination of the whole 

 genus is necessary. 



The isolation and cultivation of the fungus are dealt with at 

 length, oospores being obtained in special abundance on various 

 media derived from oats. Conidia were produced when fragments 

 of mycelium were transferred to sterilized peat-water, and are appa- 

 rently always produced under water, and not on aerial mycelium. 



The development of the sexual organs is described in detail. 

 The oospore arises from the result of the penetration of the male 

 organ by the female in the earliest stages. The oogonial incept 

 enters the antheridium at or near its base, grows up through it 

 and out at the top, expanding there to form the oogonium proper 

 in which the oospore develops. It is not certain whether fertilization 

 occurs, but if so it would appear to take place before the formation 

 of the oosphere. 



Other species of Phytophthora were examined. P. infestans and 

 P. Phaseoli agree with P. erythroseptica in method of oospore- 

 development; whilst P. Cactoriun, P. Fagi, and P. Syringae develop 

 in the manner described by De Bary for P. omnivora. 



It is suggested that only those species whose sexual organs are 

 of the hifestans-iYPQ should be retained in the genus Phytoph- 

 thora, and those which follow the Cactorm7t-type should be placed 

 in a new genus for which the name Nosemia is proposed. The genus 

 Phytophthora as emended should be removed from the family 

 Peronosporaceae and constitute the sole member of a new family 

 Phytophthoraceae. A. D. Cotton. 



Roper, J. B., The Green Muscardine Fungus and its use 

 in Cane Field. (Trinidad and Tobago. Dept. of Agric. Circular 



X^. 8. 10 pp. 2 PI. March 1913.) 



The paper deals with the culture in cabinets of Metarrhisiwn 

 anisopliae (the Green Muscardine fungus parasitic on various insects) 

 with a view to its application for the Frog-hopper scourge. Preli- 

 minary experiments being satisfactory the fungus is now being 

 grown on a large scale. Inoculation methods and other sugestions 

 are given. A. D. Cotton. 



Trottep, A, , Contributo alla conoscenza delle galle dell' 

 America del Nord. (Bull. Lab. Zool. gen. e agr. della R. Sc. 

 sup. di agric. di Portici. V. p. 100—133. pl. I. 1910.) 



Contribution importante ä l'etude des galles de l'Amerique 

 du Nord; plusieurs nouveautes. C. Bonaventura (Florence). 



Trotter, A., Contributo alla conoscenza delle galle della 

 Tripolitania. (Marcellia. X. p. 210—219. 1912.) 



La Tripolitanie n'avait pas encore ete l'objet de recherches 

 cecidologiques; jusqu'ä present ou ne connaissaii que quatre galles: 

 Acacia fistula (fourmis), Pistacia atlantica {Pemphigus utriciilaris) , 

 Artemisia pyrornacha {Rhopalomyia), Ficus Carica ^Blastophaga gros- 



