94 BOTANICAL GAZETTE. { April, 
_ Slow streams, base of Sierra Madre, state of Chihuahua, 
Mexico, October, 1887 (C. G. Pringle, no. 1447). ir 
his species is the first that has yet appeared within the 
limits of Mexico. Mr. Pringle writes: ‘* The Isoetes was 
found in several different stations, in the shallows of slow 
rills of the sandy plains about the continental divide, at an 
elevation of 6,000 to 7,000 feet, and growing as well in the 
wet sand as in the bottom of pools. Its leaves—what the — 
specimens scarcely show since they were dried—were sinu- 
ous and channeled above,”’ 
Sh Lies aU ran SER 
Isoetes maritima. Amphibious or mostly terrestrial: root- 
stock small, only slightly bilobed: leaves 8—1 5, rigid, green, 
2-5 cm. long, 1.5 mm. wide with abundant stomata: sporan- 
gia oval 4 mm. ong, 2.5mm. wide, brownish-white, covered 
one-third to one-half by the velum: ligule small, Inconspicu- 
ous: macrospores 0.42-0.48mm. thick, densely spinulose, 
_ white, smooth, 0.032-0.0 m. thick, 
aie. Salt marsh, Alberni, Vancouver Island, August, 1887 
CF. Macoun).' 
This species, next to gmza, is the smallest of our 
marked characters; from T. Nuttallii it differs by its size, its” 
_ partial velum and the sculpture of its spores. 
Syracuse, NV. 7. 
BRIEFER ARTICLES, 
Lichens from the Easter Islands.—During the year 1885 the United — 
States steamer « Mohic fc 
se images arrived they were thickly cov 
d a single species of moss. Mr. Henry 
condition would permit, ti 
L., and a sterile Parmelj 
an) TWi ’ 2 . . 3 
tallii extendine ae of. Macoun Sends from his collection in Vancouver Island I. heb 
~~ Thave referred prac sen8e, of that species northward from Oregon, and two forms W ny 
’ described form of the oo any to I. echinospora, though both iffer somewhat ie trout 
fresh water (Sproat Lake wee The habits of the two were different, one coming h 
€) and the other “ between tides, in flowing water.” a, 
