40 BRITISH CHAROPHYTA. 



form of bulbil represents the internode of an outgrowth 

 from a root-node, there being one node at the base of 

 the bulbil consisting of a few small cells and another at 

 the distal end, the cells of the latter being half -buried 

 in the thick cell-wall of the bulbil, which consists of a 

 number of layers. Either or both of these nodes may 

 produce young plants (see Fig. 11 ii). Dr. Griesenhagen 

 describes the starch-grains contained in the bulbils as 

 roundish-discoid, displaying a distinct series of layers 

 and, in the largest examples, attaining a length of 

 '15 mm. When the starch becomes absorbed by the 

 growth of the young plant the bulbils lose their opacity. 

 Miss M. McNicol in her investigation of the bulbils 

 of Lamprotkamnus alopecuroides, = Lamprothamnium 

 papulosum (' Annals of Bot.' xxi, p. 61, 1907) found in 

 that species that secondary bulbils were developed 

 from the nodes at the base and apex of the primary 

 bulbils, and that in some cases the secondary bulbils 

 in like manner gave rise to tertiary bulbils. Bulbils 

 of the spherical form are also produced by Char a 

 macropogon Braun, an Australasian species, in great 

 abundance. 



The second type of bulbil, that consisting of an 

 agglomeration of numerous small starch -bearing cells, 

 has been fully described and figured in the case of 

 Char a frag if era, G. delicatula, and C. baltica. These 

 bulbils are produced most abundantly by the first-named 

 species, and it was from this that they were originally 

 described by its discoverer, Durieu de Maisonneuve, 

 in 'Bull. Soc. Bot. France,' vi, p. 182 (1859), the 

 specific name fragifera be lug given on account of 

 the fancied resemblance of the multicellular bulbil to a 

 strawberry (Fig. 12 i). The bulbils are produced as 

 lateral growths on both stem- and root-nodes (Fig. 12 



