116 
§ 122. Appearance and disappearance of plants.— * * * A 
‘part of our river (the Charles) is laid bare for mill repairs once a 
year, giving a fine chance to look for rare water-plants. After 
searching many seasons in vain for Isoetes, I at last found the bot- 
tom of a canal covered like a field of grass with one species. This 
season there is little of it, but in its place a small Chara, Nitella 
gracilis, 8m. So of Utricularia gibba, L.: after years of search, I 
found it right in my most frequented path, covering half an acre of 
wet meadow land so completely that I could not step without crush- 
ing the beautiful little yellow flowers. Polygal4 polygama, Walt., 
has always been rare in this vicinity, but one year it came in on a 
sandy roadside, covering the ground with the finest plants I have 
ever found. Neither of these plants has again been seen on the 
same ground. I searched ten years for good specimens of Rhexia 
Virginica, L., for my herbarium, when, as if by magic, an acre of 
ground was all ablaze with it. These lasted two or three years and 
disappeared. The same might be said of Drosera longifolia, L., 
and several other plants. -W. Epwarps. 
South Natick, Mass. 
§ 123. Opuntia vulgaris, Mill—Since my note in the last No. 
Ihave examined Opuntia vulgaris from Harper’s Ferry, Va., and 
O. Rafinesquii from Illinois, both in cultivation by Thomas Meehan, 
Germantown, Pa., with judgment confirmed. I have also received 
specimens of O. Rafinesquii from Woodbury, N.J., from the same 
kind of soil as the Haddenfield specimens. These bear tubers on 
the roots as mentioned in Vol. IV. of the Pacific R. R. Reports in 
the case of O. fusiformis, a form of O. Rafinesquii. I have not suc- 
ceeded in finding tubers on O. vulgaris, and the published 
description makes no mention of them. T. C. Marrinpare. 
§ 124. Coplay, Lehigh Co., Pa.—I notice that the southern limit 
for Aspidium acrostichoides, Swartz, var. mecisum, as given by Mr. 
Edwards’ Catalogue of North American. Ferns, is New York. I 
take pleasure in stating that it has been found growing in Lehigh 
Co. by Mr. P. A. Lantz, of Saegersville, who favored.me with a tine 
specimen. I have found here this season Eriophorum gracile, Koch, 
and Rhyncospora alba, Vahl. Are these plants common to South- 
ern Pennsylvania? Ihave not found them as yet in any other 
locality hereabouts. | A. F. Krovt. 
. § 125. Supplement to the Directory—Additions and Correc- 
10ns.— ; 
Allen, Dr, T. F., 10, E, 36th St., New York. March, W. T., Spanishtown, Jamaica, W. I.; 
Bechdolt, Robert, Bethlehem, Pa,; not active, deceased. 
Hess, Dr. R, J., Bethlehem, Pa.; removed. Rose, Miss Mary W., not Roe, Clyde, N. Y. 
Ruger, M. C., 54, Tompkins St., New York. 
Errata.—P. 109, read ‘ Fud$ vesiculosus”; p. 111, lines 8 and 9, read 
“Rhodombifiacer,” and “ Rhodolyenia.” ; 
Terms—One Dollar per annum beginning with the January number, 12 cents for ta. 
For the Botanical Directory 30 cents. Supplement to Directory, 10 cents. vole T-¥., with 
index, and photograph of Dr. Torrey, $3.15. Copies of Constitution and By-Laws of the Club, 
Sra cents. Address, Wm. H, LEGGETT, 224, E. Tenth Street, New York, Money Orders on 
Station D., P.O., N. ¥. All subscriptions or orders filled only on receipt of the money. 
The Club meets regularly the last Tuesday of the month in the Herbarvum,. Columbia College, 
at%i¢ P.M. Botanists are invited to attend. D 
volt! pao ane n R. THURBER, the President of the Club, may 
