290 Morphologie, etc. — Varietäten etc. 



pylar haustorium formed thus: the endosperm nucleus of the embryo 

 sac lies toward the antipodal end, and after repeated divisions forms 

 a mass of cells at this end; the sac becomes constricted so as to 

 assume an hour-glass shape; and meanwhile the suspensor of the 

 proembryo elongates considerabl}'', so as to carry the embryo into 

 the antipodal end of the sac. A few nuclei escape into the micro- 

 pylar region, enlarge, and convert this region into a coenocytic 

 haustorium. The antipodal end of the sac becomes elongated into 

 a tube or process which approximates the vascular supply to the 

 ovule. M. A. Chrysler. 



Johson, D. S., Studies in the development of the P/^ra- 

 ceae. I. The suppression and extension ofsporogenous 

 tissue in the flower of Piper betel L. var. monoicum C. DC. 

 (Journ. Exper. Zool. IX. p. 715 — 749. figs. 1—71. [no date given] 

 1910.) 



The development of the gametophyte in Piper betel may be 

 regarded as normal, resulting in the production of a binucleate 

 pollen grain and an eight nucleate embryo sac. After fertilization 

 about one hundred free peripheral nuclei are found before an3^ cell 

 walls appear in the endosperm. Meanwhile the antipodals increase 

 to one hundred or more; these persist in the seed, but contain 

 little stored food. The endosperm also contains little food, but the 

 perisperm is abundant and starchy. The fiowers may contain mi- 

 crosporangia or megasporangia or both, and the extent of develop- 

 ment of each of these is exceedingly variable. The number of 

 microsporangia in an anther varies from none to four, and the 

 extent of a Single sporangium varies from one-fourth to three-fourths 

 of the volume of an anther, though there is no evidence of fusion 

 or abortion of sporangia. This study supports the view that the 

 tissue of the young spike, and often of the individual flower, is 

 hermaphrodite. M. A. Chrysler. 



Daniel, L„ Sur un nouvel hybride de greffe entre Aube- 

 pine et NtSflier. (C. R. Ac. Sc. Paris. CIL. p. 1008-1010. 1909.) 



Parmi les hybrides de greffes connus, D. cite TOrange Bisar- 

 ria, le Neflier de Bronvaux, le Cytisus Adami, le Poirier-Aube- 

 pine de Ville, le Premier panache de Nomblot, le Poirier-Coignas- 

 sier de Rennes et ceux qui ont ete obtenus dans la Vigne ou les 

 plantes herbacees. II a pu examiner un nouvel hybride de greffe entre 

 Aubepine et Neflier, Signale par C. Brun, de Saujon (Charente- 

 Inferieure). Un sujet tres vieux d' Aubepine type (Crataegus oxya- 

 cantha) a ete greffe il y a longtemps ä 1,70 m. du sol sur 5 bran- 

 ches et en fente, avec un Neflier ä gros fruits. Au niveau du 

 bourrelet, il y a 7 ä 8 ans, s'est developpee une branche qui se 

 ramine ä 15 cm. de son insertion, donne un rameau d' Aubepine 

 pure et „le reste constitue deux formes hybrides plus ou moins in- 

 termediaires entre le Neflier et plus ou moins retombantes." 



Une des formes a des feuilles entieres, velues comme celles du 

 Neflier, mais beaucoup plus petites; eile porte des £pines et donne 

 des Nefles allongees, petites, de taille legerement supeYieure au fruit 

 de l'Aubepine. 



L'autre ä feuilles decoupees, donne des fruits qui rappellent 

 ceux de l'Aubepine, mais ä epiderme gris et rugueux, ou ä epiderme 

 lisse et colorö de rouge; dans certains fruits, ces caracteres etaient 



