XI. 
PAPERS ON ISOETES.* 
I. THE SPECIES OF ISOETES IN PARRY’S BOTANICAL OBSERVATIONS IN 
WESTERN WYOMING 
FroM THE AMERICAN NaturaList, Vou. VIII. 1874. 
307. Isoiites BoLANDERI, Engelm. — Trunk deeply 2-lobed ; leaves (5-20, 2-43 inches long) gy [214 (24)]} 
slender, tapering to a very fine point, bright green, soft ; agit lace cells elongated ; with stom 
without peripherical bast-bundles ; sporocarp mostly oblong, covered about 4 or } be the Gales sauna macro- 
spores (0.30-0.45 mm. wide) beset with minute points and wrinkles; microspores (0.026—-0.031 mm. long) more or less 
papillose or spinulose, deep brown. —In ponds and shallow lakes on the Sierra Nevada of California, at an altitude 
of 5,000-10,000 feet, “scattered or rarely in small patches” (Tuolumne, Mount Dana, Mono-trail, Cisco, Mary’s Lake, 
H. Bolander, 1866 and 1870), and on the Rocky Mountains, “densely ceespitose” (Yellowstone Lake 7,400 feet alt. 
C. C. Parry, No. 307, 1873). 
This species represents in the western mountain regions our eastern wide-spread Isoétes echinospora, var. Braunii, 
and the very local I. saccharata. Both collectors found it growing in soft mud covering gravel, and always submerged, 
but the abundant stomata would seem to indicate that the plant, at times, vegetates out of water. Leaves very slender, 
3-4 line in diameter in the lower third, very broad winged below and toward the base. The minute, mostly pointed 
warts on the macrospores are often confluent, and then represent short wormlike wrinkles ; in some specimens I find 
them almost obliterated. The specimens from Yellowstone Lake are characterized by rather smaller macrospores (0.28- 
* Dr. Engelmann contributed to the American Journal of mouth in the Matagorda Bay. It is widely distinct from the 
Science the following papers, which contain a few relatively three others, in having long and branching stipes (10 to 14 
uni notes by himself: ‘* A monography of the North lines long) bearing 3 to 5 capsules, three or four times as long 
American species of the genus Hquisetum,” by Alexander as these, and at the base connected with the petiole ; capsule 
Braun Ho xlvi. 1843, Pp. 81-91); ‘‘A brief notice of the obliqnely obovate, with a short rhaphe, lower tooth blunt, 
Chare of North America,” by Alexander Braun (1. c. pp. 92- upper one very indistinct ; stomata not observed on the pal- 
93); ‘On the North American species of Jsoétes and Marsi- eaceous capsule ; rhizoma nearly naked, only the ends of the 
lea,” by Alexander Braun (2 ser. vol. iii. 1847, pp. 52-56); branches paleaceous ; petioles 4 to 9 inches long, hairy ; sed 
“« Notes on some Ferns of Foe United States,” by Prof. Kunze lets triangular or fanshaped, entire, more or less covered b. 
(2 ser. vol. vi. 1848, pp. 80-89). fine paleaceous hairs, 7 to 12 lines long. It is no. atin 
per on Equisetum the following names by Engel- that this is the Marsilea polycarpa, Hook. and Grev., found 
x. 
mann appear, — EZ. laevigatum, A. Braun, B. scabrellum, En- throughout South America, and lately discovered by 
and y. elatum, oo (87], 2. robustum, A. Braun, Schiede in Mexico ; but having seen no description of it, I 
B. tals, Engelm., and +. affine, Engelm. [88]. am unable to give more than this aoe based merely 
e paper on Isoétes and Marsilea — Tsoétes riparia, on the name. If on further comparison the Texan species 
Engelm. mss. [53], and the following note should prove to be distinct, the name of Mf. macropoda would 
_ find a fi ourth species in the ealiectinl made by [56] appear to be most appropriate. Sterile specimens of a Mar- 
Mr. exas. He met with it in January, si/ea occurring in Drummond’s Texan collections, <r prob- 
in T 
16h te ooiciy Gt ate woe Guadaloupe River, near its ably to the same species as Lindheimer's plant.” 
ee en ee a ee, en ae 
| 
| 
