228 FLORA OF MOUNT DESERT. 



differs somewhat from the standard work of reference for this 

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

 land." Where the name here used differs from that employed 

 by Farlow, the latter is given as a synonym; in the case of species 

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

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

 the plants. Descriptions of the few fresh water algae will be 

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



SUBDIVISION I. RHODOPHYCE.E. 

 CORALLINACE^E. 



CORALLINA, L. 

 C. officinalis, L. 



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

 Sea Wall (Holden). 



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, Bosanoff. Melobesia Lenormandi) Farlow's 

 Manual, 181. 



Common in tide pools (Collins). 



