190 



HYDROCHARIS MORSUS-RANyE. 



[June, 



HYDEOCHARIS MORSUS-EAN^. 



On the Hybernacula of Hydrocharis Morsus-Ranse. 

 By L. C. Treviranus.* 



The fact that Hydrocharis Morsus-Rance, besides its seeds, has 

 another mode of reproduction by certain little bulbs developed 

 on the roots, which, becoming detached, pass the winter at the 

 bottom of the water, has already been noticed by Nolte (' Ueber 

 Stratiotes und Sagittaria' 6), and is alluded to by Linnseus, in 



Fig. 1. a. Hybernaculuin of Hydrocharis Morsus-Rancc, as observed 

 on the 21st of August, natural size, with the lowest scales bent back. 

 h. The same, magnified, the outer scales removed, c. A vertical section of 

 the same. Fig. 2. The same, on the 1st of March, in process of develop- 

 ment, somewhat enlarged. 



a few words, in the ' Flora Suecica.' Fried. Nees (Gen. Flor. 

 Germ. vi. t. 15) has given a tolerable representation of these 

 bulbs, but without mentioning their mode of development. When 



* Translated from the 'Botanische Zeitung,' No. 41. p. 699 (1857). 



