Easpberries ou a bifiircate thalamus 



BY 



J. C. COSTERUS. 



In Vol. IV, p. 145 (»f the présent Receuil I had an op- 

 portunity of drawing attention to spécimens of Ruhus 

 idaeus, of which the fruits covered a bifurcate thalamus. 

 I ;-^ointed out that the thalamus quite gave the impres- 

 sion of having subsequently split up and not of having 

 betn dichotomous from the outset as Godron admitted 

 for his cases. 



At the end of my paper I had to forego a décisive 

 explanation of my case, owing to the origin of the fruits 

 in question being unknown. Since thaï time, however, 

 I hâve had the good fortune to discover the origin of the 

 monstrous raspberries, viz. a garden at Hilversum, called 

 „de Proeftuin" and founded by the „Maatschappij voor 

 Tuinbouw" vvith . a view to cultivate varions kinds of 

 fruit and vegetables. In order to test riodron's state- 

 ment according to which dichotomy of the torus is the 

 primary cause of the above-mentioned phenomenon, I 

 thought it best to collect raspberries in subse<iuent stages 

 of development and possessing an augmented calyx and 

 did so on .Tune 20 and 27, July 4 and 15 and September 3. 



Recueil des trav. bot. Néerl. Vol. VI. 1909. 4* 



