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 mzhi being twice or 
more as large as his plant. 
No specimens of ,/anza 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 % ft. below the surface of a tidal pool, 
10°.4 C.; 1 ft. below the surface of open sea 10°.2 C.; Atm. 
temp. 17°.55 C. 
CoORALLINZ VERZ OF PorT RENFREW. 
1. Amphiroa cretacea Endl. f.tasmanica(Sond.). Pl. LI.,Fig.1. 
= Amphiroa tasmanica Sond. in Plant Mill.(Linnea, XXV.). 
2d: in Mill. Frag. Phyt. Austr. Suppl. 
Rite Tap. Phyc., Ville Watoay, Hig-crs: 
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 (7. c., p. 23), Amp. tasmanica Sond. is quite similar to 
Amp. cretacea Endl. and it might better be reduced as above. 
Not rare: 2-5 ft. below low-water mark, also in pools. 
2. Amphiroa tuberculosa Endl. Pl. LI., Fig. 2; Pl. LVI., Figs. 
I and 2. 
Aresehs im JoAp: Spec. Alg.,:11.; p.n538- 
Harv: Ner. Bor. Am., p. 86. 
= Corallina tuberculosa Post. et Rupr. Ill., p. 20, t. go. 
Kiitz's) spec: alg, p74. 
?= Amphiroa (Arthrocardia) epiphlegnoides J. Ag. in Har- 
vey’s Notes on N.W. Am. Alg.(Journ. of Linn. Soc.,VI., p. 169). 
= Amphiroa californica in Prov. Museum at Victoria, B. C. 
Judging by the figure delineated by Postels and Ruprecht 
(2. 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, cordate or 
sagittate, sometimes cylindrical or clavate; the cordate or sagit- 
tate articuli are more or less compressed and generally with 
subevident rib on the shaded surface: the terminal articuli are 
