58 The Botanical Gazette. [February, 
where he says, ‘‘In one place in Turner’s work, the native 
country of this plant is said to be Central America, in an- 
other place, North America.” I have two complete speci- 
mens, one in fruit, that I collected a short distance from Pa- 
cific Grove, Cal., which are unquestionably this plant. 
§Il. Plant 1-ribbed. 
Costaria reticulata, n. sp.— PLATE VII. 
Plant thin, olive green, two feet or more in length, two to 
ten inches broad; stipe short, 3-13 inches in diameter, fur- 
nished with numerous dichotomously branched rootlets. 
Plant furnished with a broad central midrib twice the thick- 
ness of the remainder of the blade; midrib one-half to two 
inches in width; the surface, except the midrib, covered 
with coarse reticulations which gradually diminish in size to- 
wards the union of blade and stipe. Zoosporangial areas, 
dark brown patches of olive brown spores scattered over the 
surface of the blade, often covering midrib; sporangia indis- 
tinguishable from those of Costaria Mertensii J. Ag.—Hab-_ 
itat south shore of Monterey Bay, near Pacific Grove, Cal. 
Lincoln, Neb. 
EXPLANATION OF PLaTE VII. 
. Costaria reticulata, n. sp. Reduced one-half.— Fig. 2- 
Transection, showing union of body and midrib, and the zoosporan- 
¢ 70.—Fig. 3. Longisection of midrib. x 70.—Fig. 4. Transection 
showing zoosporangia. X 330.—Fig. 5. Longisection of midrib, show- 
ing ¢, h, and m, of fig. 3- X 330.—Fig. 6. Transection of stipe. X 330-— 
ig. 7. Transection of rootlet near tip. 
