242 FLORA OP xMOUNT DESERT. 



VALONIACE^. 



CODIOLUM, A. Br. 

 C. longipes, Foslie. 



Fronds proportionally longer and slenderer than in typical 

 C. gregarium. Common on rocks near Seal Harbor (Collins) ; 

 — on rocks between tide marks, Sea Wall (Holden). 



C. gregarium, A. Br. 



A few plants of the typical form of this species have been 

 found mixed with C. longipes and with transitional forms. It 

 is doubtful whether the two species are distinct. If they are 

 not, C. gregarimn as a specific name has the priority. Seal 

 Harbor (Collins). 



GOMONTIACE^. 



GOMONTIA. Born. & Fl. 



Fronds branching; individual cells transformed into large 

 round, oval, or clavate sporangia, which at length separate from 

 the frond, and develop zoospores and resting spores. 



G. polyrhiza (Lagerh.), Born. & Fl. 



Filaments .004-. 008 mm. diam. ; sporangia .03-.04 mm. diam. 

 Appears as a grass-green stain on dead shells. Seal Harbor 

 (Collins). 



CONFERVACE^. 



CLADOPHORA, Kuetz. 



C. arcta (Dillw.), Kuetz. 



Very common in tide pools (Collins) ; — Somes Sound (Holden). 



Forma centralis. 



Probably merely an older stage. Sea Wall (Holden). 



C. lanosa (Roth), Kuetz. 



In tide pools near Seal Harbor (Collins). Apparently not 

 very common. 



