222 Rhodora [NOVEMBER 
izations fits satisfactorily the American plant, which has as we have 
seen, ovate sepals about two-thirds the length of the petals. It is 
more than probable that the elements included by Trautvetter in his 
var. /eiocarpus were quite different from each other, if not specifically 
distinct. When to this fact is added his vague and fragmentary 
characterization and the great geographic distance of the Siberian 
station, the treatment of the American plant as a separate species 
seems to be fully justified. 
R. Allenii possesses a curious and interesting habital resemblance 
to the plant of southern Missouri and adjacent Arkansas, which was 
described as A. abortivus, var. Harveyi Gray, Proc. Am. Acad. xxi. 
372 (1886), and which has since been raised to specific rank by Dr. 
Britton. The northeastern plant has, however, a decidedly lower 
stature and rounder petals. ‘The marked difference of geographic 
range and habitat would furthermore render specific identity 
extremely improbable. 
Gray HERBARIUM. 
PHYCOLOGICAL NOTES OF THE LATE ISAAC 
HOLDEN, — II. 
EpIiTED BY F. S. COLLINS. 
` (Continued from p. 172.) 
Lyngbya subtilis Holden. 774,779. Seaside Park. Dec. “This 
appears to have filaments attached at the middle. Can find no termi- 
nal hairs. Has it any chroococcoid stratum except the P/eurocapsa 
with which it is associated and upon which it appears to be epiphytic? 
Escaped hormogonia U-shaped. Branching?.” 
L. lutea (Ag.) Gomont. 939, 1060, 1473, 1501, 1507. On wood- 
work between tide marks, below Yellow Mill Bridge; on turfy bottom 
at Seaside Park; among Z. aestuarii (Mert.) Liebm., Cook's Point; 
on sandy mud, Charles Island. May-July, Oct. 
Symploca hydnoides Kütz. 862. With other minute algae in Yellow 
Mill Pond. Aug. 
