CATALOGUE OF PLANTS. 227 



CLASS III. THALLOPHYTA. 

 DIVISION I. CHARACE^E. 



NITELLA, Ag. 

 N. opaca, Ag. 



Ponds and streams; common. Smith Brook, High Head ; 

 Deer Brook; Canada Brook; Jordan Stream (Rand); Long 

 Pond, Eden (E. Faxon) ; at outlet Hadlock Lower Pond (Isaac 

 Holden). 

 N. flexilis, Ag. 



Specimens of a Nitella, probably this species, have been found 

 in several localities. Mouth of Hunters Brook; Somes Stream; 

 Deer Brook (Rand); Great Pond (Isaac Holden). 



DIVISION II. ALG^E. 



List prepared by Frank S. Collins. Plants collected by 

 Frank S. Collins and Isaac Holden. 



So far as fresh water algae are concerned, the following list 

 contains only a few species which have come under the notice of 

 the collectors ; to make even an approximately representative 

 list would take careful collecting and study for years; this must 

 be left for future students. In the representation of marine 

 algae, the list is more satisfactory, but here also it is undoubt- 

 edly far from perfect. For instance, there will be noticed three 

 species which find a place here only on authority of minute 

 fronds observed on other specimens; it is more than likely that 

 there are other species equally deserving of a place, but not 

 equally fortunate in securing it. 



The fact that thus far collecting has been done almost entirely 

 in the summer months accounts for the absence of some species, 

 which there is every reason to expect in this locality. Still, 

 allowing for these deficiencies, the list gives a fairly good idea 

 of the marine flora of the Island, that sub-arctic flora charac- 

 teristic of the northern New England coast. 



The arrangement of species, genera, etc., is based chiefly on 

 Engler and Prantl's " Natiirlichen Pflanzenfamilien, " which 



