66 Rhodora [March 



permitted the inclusion of her collection data for such unreported 

 hepatics as she had found, and which had later been independently 

 detected by the writer. Samples of these were sent to her for de- 

 termination. Previous to his last visit Miss Lorenz spent part of 

 two summers in the collection and study of the hepatics of the is- 

 land, a full report on which will appear in due time. It will be seen 

 that the list is not one of little known forms, but rather of plants 

 elsewhere familiar, which due to local scarcity or other causes, have 

 escaped observation here. Several fresh-water algae are included 

 since a few were admitted to the Rand and Redfield Flora, but the 

 total of species reported represents but a small fraction of the prob- 

 able number present on the island. Determinations were wherever 

 practicable verified by comparison with identified material from a 

 dependable source, or by the kindness of Dr. Marshall A. Howe, 

 Mr. Stewardson Brown and Mr. George B. Kaiser, to whom certain 

 specimens were submitted and to whom the writer is much indebted 

 for assistance. For literature on Maine plants he must thank Mr. 

 Arthur H. Norton. Specimens are to be found in the herbaria of 

 the University of Pennsylvania (U. P.) and the writer (T.). 



Mougeotia genuflexa (Dillw.) Ag. Lower Hadlock Pond, Sept. 

 1920 (T. 3125). 



Botryococcus Braunii Kiitz. 3 Echo Lake, Aug., 1920. 



Tetraspora lubrica (Roth) Ag. Stream in woods, between 

 Lower Hadlock Pond and Northeast Harbor, Sept., 1920 (T. 3131). 



Chlorococcum humicola (Naeg.) Rabenh. Ice Pond, Manset, 

 Aug., 1920 (T. 3119). 



Codiolum petrocelidis Kck. Seawall, among filaments of Pctro- 

 celis, Aug., 1920 (T. 3128). 



Zoochlorella parasitica Brandt. In Ophrydium, Ice Pond, 

 Manset, Sept., 1920 (T. 3120). 



Ankistrodesmus falcatus (Corda) Ralfs. Pool in an old cellar, 

 abundant, Manset, Sept., 1920 (T. 3118). Associated with this 

 were the following four species: 



Kirchneriella contorta (Sehmindle) Bohlin. Scarce. 



Scenedesmus DiMORPHiis (Turpin) Kiitz. Abundant. 



Scenedesmus abundans brevicauda G. M. Smith. Very scarce. 



Scenedesmus quadricauda parvus G. M. Smith. Scarce. 



J Identification based on living material, not abundant enough for preparation of 

 an herbarium specimen. 



