THE SPECIES OF ISORTES OF THE INDIAN TERRITORY. 451 
0.38 mm. wide) and a little smaller (0.026-0.029 mm.) almost smooth microspores, and may be distinguished as var. 
Parry. 
The only other species of Isoétes, thus far found in the western mountains and on the Pacific slope, are, — 
IsoiTEs PremMzA, Engelm. — Very submerged, few (5-10), short (} to 1 inch), stout, rors oe [215(25)} 
dark-green leaves, with very short, often even square epidermis cells, without stomata o ndles 
cular sporocarp with a very narrow velum ; macrospores 0.36-0.50 mm. wide, marked with sali ei more 
rarely confluent, rather sharp points ; microspores (0.024-0.027 mm. long) brown, very minutely papillose or almost 
smooth. — In large patches in mud, covering gravel, deeply submerged in running water, on the Mono-trail, eastern 
declivity of the Sierra Nevada, 7,000 feet alt., H. Bolander, 1866. Closely allied to the last species, distinguished by 
its stout, short leaves without stomata, and the markings of the larger macrospores, etc. ; in many respects near J. 
lacustris, 
Isoétes Nurrauuu, A. Brawn in litt.— Terrestrial, trunk scarcely lobed ; leaves (20-60, 3-7 inches long) 3-angled, 
slender, firm, erect, light-green, with numerous stomata and 3 peripherical bast-bundles ; sporocarp mostly oblong, 
entirely covered by the velum ; macrospores (0.35-0.52 mm. wide) densely covered with minute but prominent, 
rounded warts ; microspores (0.025-0.028 mm. long) agen deep brown. — On damp flats or springy declivities 
in Oregon ; on the Columbia, Th. Nuttall, 1833 ; Camass Prairies of the Cour d’Aleines, Chs. Geyer, 1843 ; Willam- 
ette Valley, Z. Hall, No. 693, 1871. Thin but firm leaves, as ache land Isoétes have, with three strong astlcndiee 
eapp ane. to the 3 angles. Trunk rhombic in transverse section, only superficially divided by a shallow groove 
into two lobes. Closely allied to I. melanopoda of the Mississippi Valley, which Mr, Hall lately discovered also in 
an but resembling in the velum the two Florida species I. flaccida and I. Chapmani. 
Iso#TEs ECHINOsPORA, Dur., var. Braun, Engelm. —In the Uintah Mountains, at 9500 feet alt., S. Watson. 
The westernmost and the highest known locality of this species. 
Il; THE SPECIES OF ISOETES OF THE INDIAN TERRITORY. 
From THE Botanica GAzETTE, Vot. III. 1878. 
a MELANOPODA, J. Gay, originally found in Central and pone ae Illinois, then in the neighboring [1] 
of Iowa, seems to be peculiar to a belt of prairie country extending from northeast to southwest, from 
Tlinois to Iowa, the Indian Territory and Texas. Mr. E. Hall, who discovered the species in Nlinois, found it also 
some years ago in Dallas county, Texas, and now Mr. G, D. Butler sends it from the Indian Territory. However the 
other characters may vary, the macrospores everywhere readily characterize the plant. They are the smallest of any 
of our species, but varying in the same sporangium, between 0.25 and 0.35 mm., very rarely as much as 0.40 mm. in 
diameter, marked with confluent knobs and curved and twisted (worm-like), i sometimes almost indistinct, eleva- 
tions, visible, of course, only under a strong magnifier. The velum or membranaceous fold, which more or less 
completely covers the spore case, or is, rarely, wanting, is in this species usually narrow, or sometimes wider 3 in the 
southern forms it covers about one-third of the upper half of the sporangium. Full-grown specimens are $-l inch in 
diameter at the almost always black and shining base of the leaves ; these, smaller and fewer in the northern forms, 
are in the southern ones 20-50 in number and 8-12 inches in length, and, as I have described them in Gray’s Manual, 
triangular, with 4 peripherical fibrous bundles and with numerous stomata. 
Isoites Buttert, n. sp., I name an allied species discovered by Mr. Butler, near the latter, in drier soil, a much 
smaller plant with earlier (beginning of June) maturity. It is at once recognized by its larger macrospores, 0.50-0.63 
mm. in diameter, marked with distinct knobs or warts, which rarely run together. The base of the plant is only 
3 inch thick, the slender leaves with dull whitish bases, only 8-12 in number, are 3-6 or 7 inches long, of exactly the 
same structure as those of the last species. Velum very narrow or almost none. Microspores aculeolate in- both, in 
the latter species a little 1 than in the former. 
The caer of sci usually, as is well known, monecious, the exterior sporangia bearing female or mac- 
rospores, the interior, later developing ones, male or microspores. But°I. melanopoda is oftener dicecious than 
ecious. Mr. Butler examined hundreds of specimens and found about one-third monecious and two-thirds asin 
and of these the male and female plants in about equal numbers. Of Isoétes Butleri he never could find a monecious 
plant; all the specimens which he found as well as those which I meter were diccious, both sexes in Sead equal 
numbers. 
