[Vol. 9 

 154 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



(Mo. Bot. Gard. Herb.) ; flats near Limestone Gap, 13 and 

 16 June, 1877, Butler (Mo. Bot. Gard. Herb, and U. S. 

 Nat. Herb.); Limestone Gap, 16 June, 1887, Butler 24 (N. 

 Y. Bot. Gard. Herb.). 



SECT. 2. ECHINATAE 



2. ECHINATAE. Forms with 2-lobed corms; producing 

 megaspores with distinct spines; microspores smooth or rough; 

 peripheral strands lacking; never terrestrial. 



KEY TO SPECIES 



A. Stomata absent. 



a. Velum narrow, covering less than % of spo- 



rangium __40. I. ecliinospora 



b. Velum wide, covering %-% of sporangium 



40a. I. ecliinospora var. asiatica 



B. Stomata present. 



a. Megaspores with sharp spines. 



a. Smaller forms, leaves 3-6 cm. in length 41. I. Brochoni 



/3. Larger forms, leaves chiefly 8 cm. or 



more in length .. 42. I. Braunii 



b. Megaspores with blunt spines. 



a. Leaves few, 7-15, slender 42a. I. Braunii var. maritima 



p. Leaves more numerous, 20-40, stout 43. I. truncata 



40. I. echinospora Dur. Bull. Soc. Bot. Fr. 8: 164. 1861; A. 

 Br. Verh. Bot. Ver. Brandenb. 4: 297. 1862; Babington, Jour. 

 Bot. 1: 1-5. 1863; Milde, Fil. Eur. 279. 1867; Baker, Jour. 

 Bot. 18: 67. 1880, and Fern Allies, 125. 1887; Motel. & Vendr. 

 Actes Soc. Linn. Bord. 36 : 334. pi 9. 1883 ; Engelm. Trans. St. 

 Louis Acad. Sci. 4: 379. 1882. 



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



Corm 2-lobed; leaves 10-40, 5-12 cm. long, pale green, 

 stout at base, tapering to apex, spreading, recurved, with rather 

 wide membranaceous margins at base; stomata none; peri- 

 pheral strands none; ligule deltoid, rather wide at base; spo- 

 rangia globose or oval, 3-7 mm. long, with very narrow velum; 

 megaspores white, 440-540 \i in diameter, densely echinate with 

 fine truncate spines, sometimes toothed; commissural ridges ir- 

 regular in outline; microspores 23-35 n in length, rarely 40 n, 

 sometimes marked with slight reticulations. 



Distribution: British Isles, northern and central Europe. 



Specimens examined: 



