eee Fern Allies. -- [ZOE 
IsorTEs BOLANDERIEngelm. Utah: Alta,Wahsatch Mountains, 
1883 (M.E. Jones). California: Summit Valley, 1882 (Pringle); 
Bear Valley, San Bernardino Mountains, 1882 (S. B. and W. F. Parish, 
No. 1440); Corte Madera, 1887, Donner Lake, 1887, Olema, 1888, 
(Brandegee). British America: Lake Mara, Sicamous, Kamloops, 
1889 (Macoun). Some of the specimens from Olema are enormous 
for this species, having leaves 20 to 30 cm. long; they grew in water 
knee-deep. The range of this species is thus considerably extended 
both north and south. Dr. Engelmann also had it from Wyoming, 
Colorado and Washington. It has not yet been reported from Ne- 
vada, Oregon or Idaho, yet ought to be found in all these states 
and probably Arizona as well. 
Isorres Howe. Engelm. Ponds near The Dalles, Oregon, 
1880 (T. and J. Howell). 
IsoETEs NUDA Engelm. Hood River, Oregon, 1882 (Howell). 
IsoETEs SuKsporFi Baker. W. Klickitat Co.,Washington, 1886; 
(Suksdorf); in ‘‘hog wallows,”’ Carbondale, Amador Co, Cal, 
March, 1889 (Brandegee). From the California specimens we ob- 
tained the following measurements, which were not published in the 
original description: Macrospores o. 247 - 0.323 mm. thick, smooth 
or slightly tuberculate near the converging ridges; microspores oval, 
0.023 - 0.025 mm. long by 0.015 mm. broad. 
Iso—eTES Mexicana Underw., Bot. Gazette, xiii, 93 (1888). Slow 
streams at base of Sierra Madre, State of Chihuahua, Mexico, 1887 
(Pringle); Sierra de la Laguna, Baja California, alt. 5,000 feet (1890) 
(Brandegee), two forms, probably depending on station, one growing 
in water and the other in sand, plants seemingly dioicous; near 
Santo Tomas, Baja California, 1886, (Orcutt) exceedingly slender 
specimens, also dioicous. When the form-makers appear this will 
doubtless pose as forma gracilis. 
ISOETES PRINGLEI n. sp. Amphibious; trunk bilobed; leaves - 
10~20, narrow, pale green in drying, 16-25 cm. long, gradually 
tapering, rather firm, abundantly supplied with stomata; sporangium 
large (1 cm. long by 6 mm. wide in the largest plant), oval, with a 
moderately narrow velum; ligule small, triangular; macrospores 
chalky white, 0.475-0.495 mm. thick, coarsely and densely spinu- 
lose, the spines broad but seldom uniting; microspores sulphur-yel- 
low, 0.032-0.040 mm. thick, smooth. Muddy soil near Guadala- 
jara, Mexico, October, 1889 (Pringle, No. 2633). The macrospores 
