[Vol. 9 



146 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Gard. Herb, and U. S. Nat. Herb.); below Double Peak, 

 Yosemite National Park, 6 August, 1919,. Clemens 2 (U. 

 S. Nat. Herb.); above Dog Lake, Yosemite National Park, 

 30 July, 1919, Clemens 1 (U. S. Nat. Herb.). 



The varieties described have been placed with the type, since 

 the characters distinguishing them seem either inconstant or not 

 true morphological differences. Material from Yellowstone Lake, 

 described as /. Bolanderi v. Parryi Engelm. falls well within the 

 range of the type, except for shorter leaves than most other ma- 

 terial. The variety Sonnei, distinguished by "shorter, more rigid 

 leaves, apparent absence of stomata, almost orbicular macrospo- 

 rangium, spotted with small dark spots, and in wide velum which 

 covers from 1/3 to 2/3 of the sporangium/' has not been available 

 for study, but every point mentioned is the sort in which one an- 

 ticipates variation within any Isoetes species. For this reason, 

 in addition to the similarity in locality, Donner Lake, Cal., from 

 which specimens were examined that proved to be /. Bolanderi, 

 the variety Sonnei is here reduced. 



35a, Var. pygmaea Clute, Fern Allies, 228, 258. 1905. 



/. pygmaea Engelm. Am. Nat. 8: 214. 1874. 



Calamaria pygmaea Kuntze, Rev. Gen. PI. 2: 828. 1891-93. 



Conn deeply 2-lobed; leaves few (5-15), 2-2.5 cm. long, stout, 

 tapering but rather abruptly narrowed to thd apex, with con- 

 spicuous membranous margins developed only to upper level of 

 sporangium; stomata and peripheral strands lacking; ligule small, 

 triangular; sporangium small, orbicular, partly covered by very 

 narrow velum; megaspores white, 360-500 \x in diameter, smooth- 

 ish or indistinctly marked with short wrinkles and tubercles, low 

 and round in silhouette; microspores 26-30 \i, smooth to slightly 

 papillose. 



Distribution: Nevada, Arizona, California. 



Specimens examined : 

 Nevada: floating in Walker Lake, brought down from Mono Pass 



above, 14 August, 1898, Congdon 991 (Gray Herb.). 



Arizona: Huachuca Mts., So. Arizona, Lemmon (Mo. Bot. Gard. 



Herb.). 

 California: Mono Pass, eastern declivity of Sierra Nevada, alt. 



6000 ft., September, 1866, Bolander 6025 (Mo. Bot. Gard. 



