CRYPTOGAMIA ALG^E. 261 



ly visible in the main filaments, but appear to be 4 times 

 as long as broad ; in the extreme branches they are more 

 distinct and shorter. 



* * Frond Irranched. 



3. C. cndiviafolictj frond green, much branched, compressed ; 

 branches roundish, obtuse SPRENG. iv. 371. LYNGB. Hydroph. 

 Dan. 191. t. 65. Rivularia incrassata, Eng. Sot. t. 967. 



Hab. In a pond at Scrammerston limekilns, on pieces of 

 limestone and on dead shells. 



Frond green, much branched, compressed, gelatinous but 

 firm ; branches irregular, multifid, roundish and obtuse 

 towards the ends. The plant consists of a transparent 

 firm jelly, on which the form depends, and in which are 

 immersed very numerous confervoid filaments, jointed, 

 branched and divaricate. These filaments are most crowd- 

 ed towards the ends of the branches, which in consequence 

 are greenest ; they become less numerous, and sometimes 

 almost entirely disappear near the base of the frond, which 

 is then colourless. 



166. LINCKIA. 



1 . L. atra, frond globose, solid, very hard, blackish-green ; fila- 

 ments simple, straight, radiating, acuminate and fissured at the 

 apex. LYNGB. Hydrop. Dan. 195. t. 67. Tremella hcmisphcerica, 

 LIGHTF. Scot. 900. 



Hab. Sea-shores, attached to the branches of Conferva and 

 of the common Coralline. Berwick Bay. 



Small, nearly globular, smooth, glossy dark green, filled with 

 a lighter green parenchyma. It varies in size from that 

 of the smallest pin's head to that of a small pea, and is 

 with difficulty bruised under the finger, arising as much 

 from its lubricity and coriaceous texture as from its hard- 

 ness. 



2. L. dura., blackish-green, smooth, lubricous, in subglobular, 

 firm, nearly solid masses ; filaments bundled, radiating, much 

 c^eft and attenuated at the ends, which are level-topped. 

 Hydroph. Dan. 197. t. 67. GREV. Fl Edin. 322. 



