2:18 CRYPTOGAMIA 



Hah. On stones in small clear rivulets. Lamberton Moor. 

 Spring and summer. 



In dark tufts about 2 inches long, floating with the stream, 

 and so lubricous that it slips through the fingers, and is 

 with difficulty retained. It mimics the water-milfoil in 

 its appearance. " Rien ne manquerait a la beaute' de 

 cette espece, si ses ramifications etaient assez grandes pour 

 etre apenjues a la vue simple, et si sa coleur etait plus 

 brillante. Elle flotte avec beaucoup de graces dans les 

 petits rulsseaux, ou sa mobilite est si grande qu'on la pren- 

 drait au premier coup-d'oeil pour un etre anime. J,a 

 durde de sa vie est d'environ une annee : comme elle se 

 multiplie dans tous les inois, ou la rencontre a peu pres 

 dans toutes les saisons." VAUCII. 



2. B. ccerulescens, gelatinous, Ijluish-green, irregularly branched; 

 branches spreading, whorled with numerous tufts of many simple 

 moniliform filaments. Mo uo. and NEST., No. 497- 



Hab. In moss holes in peat bogs on Coldingham Moor, 

 rare, floating on the surface. 



Larger than the preceding, more diffused, and of a very 

 beautiful blue colour. 



161. DRAPARNALDIA. 



1. D. plumosa, green, very lubricous, much branched ; main 

 filaments beset with numerous alternate bushy branchlets, the 

 ultimate ones subulate, erect, irregularly alternate, crowded. 

 HOOK. Scot. ii. 77. Conferva mutahilis, DILLW. Catif. 63. t. 12. 

 C. lubrica, Eng. BoL t. 2087, not good. Batrachospermum plumo- 

 swn, VAUCH. Con/. 113. t. 11. f. 2. 



Hah. In the troughs for watering horses near the 6-mile 

 stone on the Ay ton-road, in early spring. 



The joints of the main filaments are longer than their dia- 

 meter, pellucid, or marked with a faint green band. " II 

 est difficile d'imaginer un aspect plus elegant et plus gra- 

 cieux que celui qu'elle presente au microscope." VAUCH. 



162. LYNGBYA. 



1. L. muralis, green, matted ; filaments simple, rather rigid, 

 flexuose and entangled, marked with numerous close and tolerably 



