228 FLORA OF MOUNT DESERT. 



differs somewhat from the standard work of reference for this 

 region, Farlow's "Manual of the Marine Algae of Kew Eng- 

 land." Where the name here used differs from that emploj^ed 

 by Farlow, the latter is given as a synonym; in the case of si:)ecies 

 and genera not to be found in Farlow, short descriptions have 

 been given, which it is hojjed will enable the collector to recognize 

 the plants. Descriptions of the few fresh \vater algse will be 

 found in Wolle's "Fresh Water Algte of the United States." 



Subdivision I. RHODOPHYCE.E. 

 CORALLINACEJE. 



CORALLINA, L. 



C. officinalis, L. 



Common in tide pools and below on the shore (Collins) ; — 

 Sea Wall (Holdeu). 



LITHOTHAMNION, Phil. 

 L. polymorphum (L.), Aresch. 

 Common in tide pools (Collins). 



L. fasciculatum (Lam.), Aresch. 



Occasional on shells, etc. Little Cranberry Isle (Collins). 

 This is the L. fasciculatum of Farlow's Manual, p. 182, but it 

 is doubtful if it is the European species of that name. The 

 Lithothamnia of northern Europe have been much studied during 

 the past few years, and it is quite likely that our plant belongs 

 to one of the new species formerly included under L. fascicula- 

 tum ; but it is impossible to decide without comparison of au- 

 thentic specimens. 



LITHOPHYLLUM, Phil. 



L. Lenormandi, Eosanoff. Melohesla Lenormandi, Farlow's 

 Manual, 181. 

 Common in tide pools (Collins). 



