714 MINNESOTA BOTANICAL STUDIES. 



marked Ruprecht's plant to be probably a dwarfed form. This 

 . remark is true so far as my determination is correct ; our plant 

 is little larger than Ruprecht's f . maxima mihi being twice or 

 more as large as his plant. 



No specimens of Jania could be found. The water at Port 

 Renfrew seems to be too cold to admit any member of this 

 group. We are able to give only one datum here : the tem- 

 perature of the water y 2 ft. below the surface of a tidal pool, 

 io.4 C. ; i ft. below the surface of open sea io.2 C. ; Atm. 

 temp. u. 55 C. 



CORALLINE VER^E OF PORT RENFREW. 



1. Amphiroa cretacea Endl. f.tasmanica(Sond.). PI. LI., Fig. i. 

 = Amphiroa tasmanica Sond. in Plant Mull. (Linnsea, XXV.). 



2d : in Mull. Frag. Phyt. Austr. Suppl. 

 Kiitzing: Tab. Phyc., VIII. Taf. 47, Fig. n. 

 The plant found at Port Renfrew is identical with the Tas- 

 manian form and not with Amp. cretacea, which was collected 

 in Unalaska by Ruprecht. As has been already remarked by 

 Kiitzing (/. c., p. 23), Amp. tasmanica Sond. is quite similar to 

 Amp. cretacea Endl. and it might better be reduced as above. 

 Not rare : 25 ft. below low-water mark, also in pools. 



2. Amphiroa tuberculosa Endl. PL LI., Fig. 2 ; PL LVL, Figs. 



i and 2. 



Aresch : in J. Ag. Spec. Alg., II., p. 538. 

 Harv : Ner. Bor. Am., p. 86. 



= Corallina tuberculosa Post, et Rupr. 111., p. 20, t. 40. 

 Kiitz : spec, alg., p. 704. 



? = Amphiroa (Artkrocardid] cpiphlegnoides J. Ag. in Har- 

 vey's Notes on N.W. Am. Alg.Qourn.of Linn. Soc.,VI.,p. 169). 



= Amphiroa calif ornica in Prov. Museum at Victoria, B. C. 



Judging by the figure delineated by Postels and Ruprecht 

 (/. c.} our plant may be readily referred to the present species. 

 It attains to 3-5 inches in its height with subdichotomous or 

 lateral patent branches. The articuli are extremely variable in 

 their form : those of the basal portion are invariably subcylin- 

 drical ; those of the upper and the middle portions, cordati or 

 sagittate, sometimes cylindrical or clavate ; the cordate or sagit- 

 tate articuli are more or less compressed and generally \\ith 

 subevident rib on the shaded surface : the terminal articuli are 



