Morphologie, Teratologie, Befruchtung, Cytologie. 405 
L’albumen est homogene, ses cellules ont des parois epaissies, 
sauf au voisinage de l’embryon, par un depöt d’amylo’ide. Les cel¬ 
lules contiennent de l’aleurone, de Thuile et un protoplasme alveo- 
laire avec noyau. 
L’embryon axial, de forme cylindrique, comprend un axe hypo¬ 
cotyle surmonte de deux cotyledons semi-cylindriques, dont la sur- 
face de symetrie co'incide avec le plan hilo-micropylaire. L’axe 
hypocotyle est termine par une pointe mousse, sans trace de 
suspenseur. 
Un cordon procambial axile parcourt Taxe hypocotyle et envoie 
un prolongement de meme nature dans chaque cotyledon; il se ter¬ 
mine au point de Vegetation de la radicule sur lequel l’assise epi- 
. dermique semble se continuer. C. Queva. 
Lutz, L., Sur la production de tiges ä l’aisselle des folioles 
d’une feuille composee. (Bull. Soc. bot. Fr. 4 e Serie. VIII. p. 
568—570. av. une pl. 1908.) 
L’apparition de bourgeons floriferes sur les feuilles de Tomate 
avait ete signalee par Duchartre, puis par d’autres auteurs. M. Lutz 
a constate cette meme production apres pincement sur un hybride de 
Tomate en culture forcee. Par l’etude anatomique des feuilles rami- 
feres, l’auteur montre que les elements des faisceaux des tiges sur- 
numeraires sont fournis par les parties laterales de l’arc libero-ligneux 
normal du rachis. 
Cette production de tiges sur les feuilles est attribuable ä la 
perturbation consecutive au pincement. C. Queva. 
Olive, E. W., Se xual cell fusions and vegetative nuclear 
divisions in the rusts. (Annals of Botany. XXII. p. 331—360. 
1 plate. 1908.) 
The author has investigated a number of forms of the Uredineae 
with especial reference to the two points mentioned in the title. 
The development of the caeoma t}7-pe of Aecidium was specially in¬ 
vestigated in Triphragmium Ulmariae Link, but a species of Gym- 
noconia and of Phragmidium was also examined. In these forms he 
confirms the appearance of associated nuclei in the basal cells of 
the Aecidium as described by Blackman & Christman but he 
differs in the details of the method by which that association is 
brought about. He finds that there is a definite fusion of cells in 
these forms. The two fusing hyphae are „approximately equal” and 
generally only one of them bears a sterile cell at its tip; the 
hypha without the sterile cell appears to be later in development 
than the other and to push up from below. Conjugation between the 
hyphae takes place in these forms by absorption of a portion of the 
wall between the two gametes. Nuclear migration through a very 
small pore as described by Blackman was observed in some cases 
but this is considered as merely an early stage in conjugation in 
which the wall has not yet been fully absorbed. The author prefers 
to the theory of Blackman a simpler one, in which the sper- 
matia are left unexplained and the sterile cell is considered as a 
mere “buffer cell”, the conjugation being an „equal partieipation of two 
morphologically equivalent cells to form a binucleated double cell 
— the so called fusion cell.” In the development of a micro-form, 
Puccinia transformans , a fusion of hyphae was observed which was 
