285 . 
of the anatomy of the species of Empetracee with the typical 
Ericaceze would be an‘interesting study, and this we hope to 
accomplish. 
Explanation of Plate 210. 
Fic, I. Leaf of C. a/éa, lower surface. a. Groove. 
Fic. II. Leaf of C. Conradii, lower surface. a. Groove. 
Fic, III. Outline of cross-section of leaf of C. alba. 
Fic. IV. Outline of cross-section of leaf of C. Conradit. 
: Fic. V. Portion of a cross-section of a mature leaf of (. a/éa. a. Thickened - 
cuticle. b. Lumen of the large epidermal cells. c. Thickenings of the cellulose 
wall of epidermal cells. e. Raised stomata on lower surface. f. Simple hairs, 
g. Glands. 
Fic. VI. Portion of cross-section ofa mature leaf of C. Conradii. a. Thickened 
cuticle. b, b. Lumen of epidermal cells. c, c. Thickenings of cellulose wall of epi- 
dermal cells, d. Midrib. e. Raised stomata. f. Simple hairs. g. Capitate glands. 
Fic. VII. Cross-section of stem of C. a/éa one year old. a. Epidermis, b. Rind 
parenchyma. c, Endodermis. 
‘ \ 
Some New and Rare Desmids of the United States. 
By L. N. JOHNSON. 
(PLATE 211.) 
During the last two or three years the writer has examined 
quantities of material rich in Desmids from various parts of the 
country. Among the species noted are some rarities, while a few 
are apparently unrecorded from the United States, and several are 
undescribed. It is not my purpose here to give complete lists of - 
all species found, but merely to mention some of the most inter- 
esting “finds.” The Connecticut specimens mentioned, unless 
otherwise stated. below, were collected at Bridgeport, those from 
New York at Cold Spring: Harbor and the Michigan material 
at New Baltimore. Curiously enough in these gatherings some 
of the species recorded by Wolle as common have proved very 
rare, or have not been seen at all. For example, Zé¢memorus Bre- 
o® 
bissonii (Menegh.) Ralfs. has been found but once, and then bute. 
