19--^] Setchell-Gardner: Melanophyceae 673 



This form is remarkable for the abundance of receptacles it pro- 

 duces on a single plant. Plate 5 of Gardner was made from a portion 

 of a plant that had approximately five hundred and fifty receptacles. 

 It is also rather unusual that so many of the segments should fruit at 

 the same time as is the case in this form. Not a single segment remained 

 sterile in the above mentioned plant. This form does not seem to be 

 abundant in the Puget Sound region. 



13. Pucus furcatus f . angnstus Gardner 



Fronds narrow, caulescent, rigid, subcartilaginous, 20-35 cm. high, 

 dichotomous, dark olive green, black on drying; segments linear to 

 slightly cuneate, 4-7 mm. wide, apices truncate, midrib distinct and 

 perciirrent, caecostomata 125-175 per sq. cm. ; receptacles mostly com- 

 planate, occasionally inflated, definitely delimited, deeply bifid, 4-7 

 cm. long, apices acute or acuminate; conceptacles numerous, closely 

 placed. 



Growing in abundance on rock ledges in the upper third of the 

 littoral belt. San Juan County, Washington, and the central coast 

 of Oregon. 



Gardner, Genus Fucus, 1922, p. 18, pi. 4, 



This form was found at Sunset Beach, near the mouth of Coos Bay, 

 Oregon, and at Cattle Point, at the south end of San Juan Island, 

 Washington. This latter locality is particularly rich in forms of 

 Fucus. There is an intermingling of the waters flowing among the 

 islands to the north and east, which have a varied Fucus flora, with 

 the waters from the Strait of Juan de Fuca and the Straits of Georgia, 

 Avashing the shores of land to the west and north, which have a some- 

 what different Fucus flora. The shore of the south side of Cattle 

 Point is exposed to a swiftfly flowing current and to the action of 

 swells from the Pacific Ocean, through the Straits of Juan de Fuca. 

 Around to the north side of the point the shores are affected but little 

 by the action of the surf and tides. 



2. Fucus membranaceus Gardner 



Fronds variable in size from a few cm. to 4 dm. high, decidedly 

 membranaceous, dark olive brown, to decidedly yellowish above; seg- 

 ments linear to slightly cuneate, strict, alae membranaceous, midrib 

 relatively small but distinct and percurrent, cryptostomata scattered. 



