(y Biologie. — Hybriden. — Morphologie. 



bats swallow and evacuate the seeds, or carry them in some 

 other way, is not determined. 



The fruit of Urceola spp. is a dehiscent woody follicle, 

 containing numerous seeds. The silky hairs attached to the 

 seeds adapt them for wind-distribution. The seeds of Willough- 

 beia spp. are embedded in an edible pulp and their distribution 

 depends mainly on animals. Owing to the shape of the fruit, it 

 frequently rolls some distance on falling to the ground. 



The winged fruits of the Dipterocarps descent in the Posi- 

 tion of a „shuttlecock" with a slow rotary motion and frequently 

 travel considerable distances. By the bursting of the capsules, 

 the seeds of the Para Rubber (Hevea brasiliensis) are pro- 

 jected 15 to 20 paces from the parent tree. 



H. H. W. Pearson (London). 



FOUCAUD, J., Un hybride nouveau. (Bull, de la Soc. bot. 



rochelaise. XXIII. 1901. p. 22—24. La Rochelle. 1902.) 



Cet hybride entre le Conyza ambigua DC. et VErigeron canadense 

 L., decrit sous le nom de Conyza mixtet Foucaud (hybride nouveau), 

 observe par l'auteur au jardin botanique de la Rochelle, a ete trouve 

 d'ailleurs en 1895 et en 1901 par M. Neyraut aux environs de Bordeaux.. 

 On devra le rechercher dans les localites oü croissent les deux parents. 



Henri Hua. 



COOK, Melville THURSTON, Development of the Embryo- 

 sac and Embryo of Castalia odorata and Nymphaea 

 advena. (Bulletin of the Torrey Botanical Club. XXIX. 

 p. 211—220. Apr. 1902.) 



The development of the embryo-sac is of the normal type. 

 The antipodals are small and finaliy disappear. The first divi- 

 sion of the endosperm-nucleus is accompanied by the formation 

 of a transverse wall. Only the upper nucleus develops the 

 endosperm; the lower one remains undivided but increases 

 much in size. 



The embryo is at first globular in shape. It develops a 

 single cotyledon and a small suspensor — Polyembryony was 

 observed in a single case. 



The author concludes that the Nyinphaeaceae are true 

 Monocotyledons, allied to the Naiadales. D. H. Camphell. 



Lang, W. H., On the Prothalli of Ophioglossum pendulum 

 a n d Helminthostachys zeylanica. (Annais of Botany. Vol. 

 XVI. 1902. p. 23. PI. I, II, III.) 



The prothallus of Ophioglossum pendulum grew in the humus 

 collected by epiphytic ferns. It consists of short thick, cylin- 

 drical branches radiating from a central point. It is vvholly 

 saprophytic, and devoid of Chlorophyll; mycorhiza is present 

 Rhizoids are wanting, the surface being covered by short, 

 broad, unicellular hairs. The sexual organs resemble those 

 known for O. pedunculosum the spermatozoids were not exam- 

 med, nor was the embryogeny followed through. 



