"ON 
88 Rhodora [APRIL 
New York. Besides belonging in a quite distinct life-zone from the 
boreal B. lanceolatum, B. angustisegmentum differs in essentially all 
its characters from the northern species. It is a much more slender 
plant; the sterile frond has more distant narrower and thinner seg- 
ments; the fertile frond is more open, with the smaller sporangia 
distant: and more immersed in the sides of the branches or adnate 
to them, while in B. lanceolatum the larger sporangia are crowded, 
often closely approximate, and merely sessile or broadly short- 
pedicelled; and in B. angustisegmentum the spores are smaller, 
21-28 u in diameter, those of B. lanceolatum measuring 35—45 p.— 
M. L. FERNALD, Gray Herbarium. 
ALTITUDINAL Limits IN CONNECTICUT, A CORRECTION.— In. the 
March Ruopora (p. 66), in pointing out the error of limiting the 
occurrence of certain species to “elevations in excess of 1,000 feet,” 
I slipped into the opposite error, of stating too low the altitudes of the 
Connecticut stations cited. In this one paragraph alone in the entire 
review I had failed to verify the statements, since they were supplied 
by a Connecticut botanist whose painstaking accuracy is ordinarily 
above question. But here his trusting to memory and my own 
failure to verify the statements furnish a pertinent illustration of the 
necessity of constant verification in scientific work. We have together 
verified the limits. The Connecticut stations for Carex castanea prove 
to be at about 700 feet altitude; the Willington station for Ledum is at 
about 400 feet, though a recently discovered station in the state is 
considerably lower; and one of the Salisbury stations for Petasites 
is at about 720 feet altitude. The following corrections should be 
made on page 66: 
line 10; for “400” read: 700. 
for “that the" read: that some of the. 
line 11; for “between 100 and 200” read: of about 400. 
line 15; for “that the" read: that one of the. 
line 16; for “below 600” read: of 720. 
M. L. FERNALD. 
Vol. 17, no. 195, including pages 49 to 72 and plate 112, was issued 2 
April, 1915. 
