1922] 



PFEIFFER — MONOGRAPH OF THE ISOETACEAE 115 



10. I. adspersa A. Br. in Bory & Dur. Expl. Sci. Alg. pi. 37. 

 fig. 3. 1846-49; Milde, Fil. Eur. 286. 1867; Baker, Fern Allies, 

 129. 1881, and Jour. Bot. 18:106. 1880; Motel. & Vendr. 

 Actes Soc. Linn. Bord. 36: 381. pi. 11. jig. 5-6. 1883. 



/. setacea Perreymondii Bory, Compt. Rend. Acad. Paris 

 18: 1165. 1841, and Flora 27: 716. 1814. 



/. lineolata Dur. in Motel. & Vendr. Actes Soc. Linn. Bord. 

 36: 381. 1883. 



Calainaria adspersa Kuntze, Rev. Gen. PI. 2: 828. 1891-93. 



Corm 3-lobed; leaves 9-25, 7-16 cm. long, very slender, fili- 

 form, attenuated, with wide membranaceous margin at base ex- 

 tending 1-2 cm. above level of sporangium ; bases sometimes per- 

 sistent as brown scales; stomata common; peripheral strands 4 

 or more; ligule longer than wide, ovate-acuminate; sporangia 

 oval, 3-5 mm. long, spotted with brown sclerenchyma cells; 

 velum very narrow ; megaspores white, sharply angled, 328-400 \i 

 in diameter, with few coarse warts and very prominent com- 

 missural ridges ; microspores light brown, 27-34 \i long, spinulose, 

 sometimes wing-crested. 



Distribution: Algeria. 



Specimens examined : 



Algeria: Oran, May, 1844, Durieu (Mo. Bot. Gard. Herb.); dry 



flats in field, Oran, 28 April, 1842, ex Herb. Motelay (Mo. 

 Bot. Gard. Herb.); near Oran, 12 June, 1844, Bory (Gray 

 Herb.) ; along old route from Figuiers to Oran, 24 April, Oc- 

 tober, 1852, Herb, des Flores Europeenes (Balansa) 25 (Mo. 

 Bot. Gard. Herb, and Gray Herb.) ; Plateau du Djebel Santo, 



near Oran, May, 1857, Flores Regionales Algeria (Weddell) 

 16 (U. S. Nat. Herb.); Flora Africae borealis, 1910-1911, 

 Dj. Habibi, Gandoger (Mo. Bot. Gard. Herb.) ; Oran, 1907, 

 Gandoger (Mo. Bot. Gard. Herb.) ; in exsiccated pools, 

 mountain Djebel Santo, near Oran, 14 March, 1876, Warion 

 188 (Gray Herb.). 



The above species can be readily distinguished from /. velata 

 A. Br. by its narrow velum (in contrast to one almost complete), 

 by its narrower leaves, and most markedly by the smaller mega- 

 spores, of which the markings resemble more nearly those of 

 /. Boryana Dur. 



