[Vol. 9 

 136 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



pletely covered by velum ; megaspores 290-360 M in diameter, 

 with prominent high, rather narrow^ commissural ridges; sur- 

 face of megaspores gray when dry, brown when wet, smooth or 

 faintly marked with low, short or somewhat extended, usually 

 distant ridges; microspores dark brown, chiefly 30-33 n, high- 

 tuberculate or spiny. 



Distribution: Texas. 



Specimen examined : 



Texas: in shallow depression in granite on east slope of Granite 

 Mt., 70 mi. northwest of Austin, 9 May, 1914, McAllister 

 (Mo. Bot. Card. Herb, and N. Y. Bot. Gard. Herb.), TYPE. 



31. I. flaccida Shuttlew. A. Br. Flora 29: 178. 1846; Am. 

 Jour. 3: 2. 1847; Chapman, Fl. Southern U. S. 602. 1889; En- 

 gelm. Trans. St. Louis Acad. Sci. 4: 386. 1882. 



/. flaccida var. rigida Engelm. Trans. St. Louis Acad. Sci. 

 4: 386. 1882. 



/. flaccida var. Chapmani Engelm. Trans. St. Louis Acad. Sci. 

 4: 386. 1882. 



I. Chapmani Small, Ferns of Florida, 133. 1918. 

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

 Corm 2-lobed ; leaves 8-40, 10-40 cm. long, slender, light green, 

 sharp-pointed, with usually narrow, membranaceous margin ; sto- 

 matqi numerous; peripheral strands 4; ligule short-triangular; 

 sporangia oblong, 3-5 mm. long, completely covered by the 

 velum ; megaspores light, 300-500 p in diameter, sometimes less ; 

 apical face rarely smooth, usually marked centrally with few 

 large tubercles ; basal face with bold, short, rounded ridges, some- 

 times anastomosing ; microspores light brown, 26-33 n long, 

 slightly papillose. 



Distribution: Georgia, Florida. 

 Specimens examined: 



Georgia : in very shallow water or entirely emersed, in wet pine- 

 barrens, Sumter Co., 5 July, 1901, Harper 1010 (Mo. Bot. 

 Gard. Herb., U. S. Nat. Herb., and Gray Herb.) ; in slug- 

 gish pine-barren stream east of Douglas, Coffee Co., 19 July, 

 1902, Harper 1429 (Mo. Bot. Gard. Herb., U. S. Nat. Herb., 

 and Gray Herb.). 



Florida: Lake Immonia, north of Tallahassee, 1842-49, Rugel 

 (Mo. Bot. Gard. Herb.), TYPE; marshes, Apalachicola, Chap- 



