[Vol. 9 

 186 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Jalisco, 1 November, 1890, Pringle S333 (Mo. Bot. Gard. 

 Herb., Gray Herb., and U. S. Nat. Herb.). 



50. I. Flettii Pfeiffer, comb. nov. 



7. echinospora var. Flettii Eaton, Fern Bull. 11:85. 1903. 

 (name only); Eaton, Fern Bull. 13: 51. 1905. 



Corm 2-lobed; leaves 15-30, 5-8 cm. long, coarse, tapering, 

 spreading or recurved, with wide basal sheath extending upward 

 one-third of leaf length; stomata present; peripheral strands 

 lacking; ligule blunt triangular; sporangia oblong, 4 mm. long, 

 with velum developed less than half; megaspores 480-570 \\ in 

 diameter, marked with coarse low tubercles and short crests, 

 usually somewhat distant; microspores 29-33 p long, finely spin- 

 ulose. 



Distribution : Washington. 

 Specimens examined: 



Washington: Spanaway Lake, Pierce Co., August, 1895, Piper 

 2125 (Mo. Bot. Gard. Herb, and N. Y. Bot. Gard. Herb.) ; 

 shore, Spanaway Lake, 17 September, 1899, Allen (N. Y. 

 Bot. Gard. Herb.); amphibious, lake shore in gravel, Span- 

 away Lake, 7-8 October, 1899, Flett 949 (Mo. Bot. Gard. 

 Herb, and U. S. Nat. Herb.), TYPE; submerged, above in 

 driest season, Spanaway Lake, 22 September, 1900, Flett 

 (N. Y. Bot. Gard. Herb.); Spanaway Lake, under water, 

 20 May, 1911, Bar dell (U. S. Nat. Herb.) ; Spanaway Lake, 

 under water, 20 May, 1911, Zeller (U. S. Nat. Herb.). 



51. I. lacustris L. Sp. PL 1100. 1753; Baker, Jour. Bot. 18: 

 67. 1880, and Fern Allies, 125. 1887; Motel. & Vendr. Actes 

 Soc. Linn. Bord. 36: 325. 1883. 



7. leiospora Klinggraff. Schr. Nat. Ges. Danzig 6 1 : 20. 1884. 



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



Corm 2-lobed; leaves 8-40, 8-18 cm. in length, quadrangular 

 in cross-section, erect, coarse, acutely pointed, dark green, with 

 membranaceous border very wide at base, but not greatly pro- 

 longed beyond level of the sporangium; stomata and peripheral 

 strands lacking; ligule usually short, triangular; sporangia 4-7 

 mm. long, with narrow velum ; megaspores white, 500-700 M in 

 diameter, marked with numerous somewhat confluent, but little 



