286 NOSTOCHINEJE. 



1 . MONORMIA INTRICATA Berk. 



Plate LXXV. Fig. 11. 



Char. Filaments scarcely moniliform. Reproductive cells 

 infrequent, globular, in series. 



Monormia intricata Berk., Gl. of Alg. p. 46. t. 18. ; Harv. 

 in Manual, p. 185. Nostoc intricatum Meneghini, Mo- 

 nographia Nostochinearum Italicarum, p. 122. with 



% 



Hob. In ditches of the marsh to the south of Frindsbury 

 Canal, near Gravesend, in great abundance in June, 

 1832 : Rev. M. J. Berkeley. 



" Forming small roundish gelatinous masses, floating 

 amongst different species of Lemna in fresh water, but probably 

 within the influence of the tide, and also amongst Enteromor- 

 pha intestinalis, and even within the frond in brackish water. 

 The plant is at first of an olive yellow, gradually assuming a 

 greener tint, and when dried of a deep verdigris. Very gela- 

 tinous, delicately branched; the branches very flaccid. Under 

 a high magnifier the whole plant is evidently composed of 

 gelatine, in the centre of which runs a single moniliform fila- 

 ment, following the ramifications, and in its progress curling 

 to and fro repeatedly across the thread, the joints being 

 nearly globular. The specimens from the interior of En- 

 teromorpha are paler, and have often longer joints amongst 

 the globular ones." Berk. 



In the authentic specimen which I have examined of this 

 beautiful production, the articulations of the threads them- 

 selves could scarcely be called moniliform, althougn the large 

 reproductive cells were distinctly so. 



38. NOSTOC Vouch. 



Char. Frond definite, gelatinous or coriaceous, globose or lobed, 

 filled with curled beaded simple filaments. Reproduction 

 consisting of enlarged spherical cells placed irregularly in 



