[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 7. Bolanderi v. Parry i 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. 



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



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



Corm 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 n in diameter, smooth- 

 ish or indistinctly marked with short wrinkles and tubercles, low 

 and round in silhouette; microspores 26-30 |j, 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. 



