CATALOGUE OF PLANTS. 235 



Genera of Doubtful Affinity. 



HILDENBRANDTIA, Nardo. 



H. prototypus, Nardo. H. rosea, Farlow's Manual, 116. 

 Very common on rocks in tide pools, etc. (Collins). 



HALOSACCION, Kuetz. 

 H. ramentaceum (L.), Ag. 



Common in lower tide pools (Collins) ; — Sea Wall (Holden). 



Subdivision IL PH.EOPHYCEJC. 

 FUCACE.E. 



ASCOPHYLLUM, Stack. Rockweed. 

 A. nodosum (L.), Le Jolis. 



Very common everywhere on the coast (Collins). 



FUCUS, L. Rockweed. 

 P. filiformis, Gmelin. 



In upper tide pools. Near Seal Harbor (Collins). 

 F. edentatus, De la Pyl. F. furcatus, Farlow's Manual, 102. 



Near Life Saving Station, Little Cranberry Isle (Collins). 

 P. evanescens, Ag. 



Common all along the shore (Collins). 

 F. vesiculosus, L. 



Very common everywhere on the coast (Collins) ; — Somes 

 Sound (Holden). Occurring in uumerous forms, among them: 



Var. laterifructus, Grev. 



With the type (Collins). 

 P. platycarpus, Thuret. 



Resembling F. edentatus, but with the branching somewhat 

 lateral, rather than regularly forked, the conceptacles shorter 



