1922] 



PFEIFFER MONOGRAPH OF THE ISOETACEAE 195 



Herb., and N. Y. Bot. Garcl. Herb.), TYPE; in 4 ft. of water 

 off the dock, Maneskootuk, Rangeley Lake, 7 July, 1895, 

 Coville 62 (U. S. Nat. Herb, and N. Y. Bot. Gard. Herb.); 

 Moosehead Lake, September, 1899, F. L. Harvey 4- (Mo. 

 Bot. Gard. Herb.). 



55. I. Tuckermani A. Br. ace. Engelm. in Gray, Manual, ed. 

 5, 676. 1867; Engelm. Trans. St. Louis Acad. Sci. 4: 378. 1882; 

 Motel. & Venclr. Actes Linn. Soc. Bord. 36: 338. 1883; Baker, 

 Jour. Bot. 18: 68. 1880, and Fern Allies, 126. 1887; Under- 

 wood, Native Ferns and Fern Allies, 122. 1882; Macoun, Cat. 

 Canad. PI. pt. 4: 293. 1888; Eaton in Gray, Manual, ed. 7, 59. 

 1908; Britton & Brown, 111. FL, ed. 2, 1: 51. 1913; Clute, Fern 

 Allies, 225. 1905. 



/. Tuckermani var. borealis Eaton, Fernwort Papers, 10. 1900. 

 Calamaria Tuckermani Kuntze, Rev. Gen. PI. 2: 828. 

 1891-93. 



Corm 2-lobed, rarely 3; leaves 5-38, 3-18 cm. long, very 

 slender, tapering, olive-green, outer leaves frequently recurved; 

 stomata lacking or few in number; peripheral strands none; 

 sporangia orbicular to oblong, 2-5 mm. long, often brown-spot- 

 ted;] velum incomplete, covering about 1/3 of sporangium; 

 megaspores white, 460-600 p, rarely 650 p, in diameter, with 

 upper segments marked with somewhat parallel and branching 

 thin ridges, chiefly irregular at margins, lower segment with 

 reticulate ridges; microspores 26-34 p, rarely more (40) in 

 length, smooth to minutely papillose. 



Distribution: Labrador, Newfoundland, Quebec, Nova Scotia. 

 Maine, New Hampshire, Vermont, Massachusetts, Connecticut. 



Specimens examined: 

 Labrador: pond, Triangular Harbor, 23 August, 1882, Allen (Mo. 



Bot. Gard. Herb.). 



Newfoundland: in 3-6 in. water, Quiddy Viddy Lake, Robinson 

 & Schrenk 239 (Mo. Bot. Gard. Herb., U. S. Nat. Herb., N. 

 Y. Bot. Gard. Herb., Univ. Minn. Herb., and Gray Herb.). 

 Quebec: on firm clay bottom, small ponds among Silurian hills 

 back of Birchy Cove (Curling), 11 August, 1910, Fernald & 

 Wiegand 24.04. (Gray Herb.); emersed, muddy border of a 

 shallow brook, Lewisport, south shores of Notre Dame Bay, 

 17 August, 1911, Fernald & Wiegand 4402 (Gray Herb.). 



