366 Eumycetes. — Pfianzenkrankheiten. 



of the basidium was observed in Boletus granulatus , B. versipellis, 

 B. glabellus, B. vermictilosiis, B. castaneus, B. albellus and B. chry- 

 senterun. 



6. The long axes of the spindles in both divisions are com- 

 monl}'- transverse to the long axis of the basidium. V'ariations , 

 however, appear in which the spindles are almost perpendicular to 

 the transverse axis of the basidium. Centrosomes and well-developed 

 astral rays are regularly present. 



7. The chromosome number in the first division is from six to 

 eight in Boletus granulatus, B. castaneuSj B. albellus, B. verniiculo- 

 sus, B. versipellis, and B. chrysenteron. In the second division the 

 exact number cannot be determined. It is, however always more 

 than two. 



S. At the end of the second division the centrosomes become 

 attached to the walls of the basidium and the four daughter nuclei 

 are reconstructed in close connection with them. As the nuclei 

 move downward in the basidium they maintain their connection 

 with the centrosomes by means of fibrillar Strands which are, per- 

 haps, analogous to astral rays. The fibrillar Strands apparently pull 

 the nuclei into the spores. 



9. The centrosomes mark the points of origin for the sterigmata, 

 They are carried up with the growth of the sterigmata and into the 

 spores. They also apparently determine the apex of growth of the 

 spores. 



10. The spores in all the forms studied are uninucleated at 

 first. The primary spore nucleus divides at once. The karyokinetic 

 figures are small but very sharply differentiated with well-developed 

 centrosomes and polar asters. In the spores of B. albellus a second 

 division occurs. 



11. In Boletus chrysenteron, B. punctipes, and B. griseus, basidia 

 with mature sterigmata are found before the completion of the 

 second division. Normal basidia are also present. 



12. An alternation of generations comparable to that in the 

 Uvedineae is also present in the Basidiomycetes. The sporophyte 

 begins at some indefinite point in the mycelium and extends through 

 the development of the carpophore. Jongmans. 



Lutz, L., Un double cas d'empoisonnement benin par 

 V Hebeloma crustuliniformis Bull. (Bull. Soc. mycol. XXXI. p. 61 — 

 62. 1915.) 



Une heure apres le repas, debutent des symptOmes d'indiges- 

 tion, suivis de troubles visuels, vomissements, diarrhee, Sensation 

 de froid, nuit agitee. Le lendemain, il ne subsistait qu'une forte 

 lassitude. P. Vuillemin. 



Blaringhem. Sur la transmission des maladies par les 

 semences. (Assoc. Avanc. Sc. Congres du Havre. 1914. p. 470— 

 478. Paris 1915.) 



Le Loliutn temulentum, VAlthaea rosea, transmettant ä leurs 

 descendants un mycelium avec leurs graines, realisent des com- 

 plexes biologiques comparables au Cytisus Jäanii. Le melange des 

 cellules de Cytisus Laburmcin et de C. purpureus au Stade de jeu- 

 nesse maintenu par des greffes frequentes, est dissocie naturelle- 

 ment ä un äge avance, artificiellement par des traumatismes. Le C. 



