1922] 



PFEIFFER MONOGRAPH OF THE ISOETACEAE 209 



surface, sometimes little sharper above ; microspores 28-35 (j in 

 length, tuberculate. 



Distribution: East London, S. Africa. 



Specimens examined: 



South Africa: East London, Lake Province, Union of S. Africa, 

 November, 1921, Schonland (Mo. Bot. Gard. Herb.). 



In the description published by Sim, mention is made of peri- 

 pheral strands as being "one marginal on each side throughout." 

 The material at hand in the single collection examined did not 

 show peripheral strands in any sections cut. In all the leaves 

 the basal portion was the chief region available, though some of 

 the narrower part was cut in a few sections. It may be that with 

 exposure near the water surface there is some development of 

 supporting tissue not witnessed in Schonland's collection. 



62. I. Duriaei Bory, Compt. Rend. Acad. Paris 18: 1166. 1844. 

 7. tridentata Dur. ace. Kuhn, Fil. Afr. 195. 1867. 

 /. ligustica de Not. ace. Kuhn, Fil. Afr. 195. 1867. 

 Isoetella Duriaei Genn. Comment. Critt. Ital. (1) no. 2: 115. 

 1861. 



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

 Corm 3-lobed; leaves 15-35, 8-12 cm. long, rarely longer, 

 slender, firm, recurved, with short wide membranaceous margins 

 at base; bases of leaves persistent, scaly, shining black, with 3 

 teeth; stomata numerous; peripheral strands 4; sporangia oval, 

 4-6 mm. long, with complete velum; megaspores white, 600- 

 830 n in diameter, with prominent commissural ridges, and faces 

 with reticulate markings produced by even, rounded elevations; 

 microspores 26-38 M in length, tuberculate. 



Distribution: Algeria, Corsica, France, Italy, Turkey. 

 Specimens examined : 



Algeria: Algeria, 1841, Durieu (Mo. Bot. Gard. Herb.); Be- 

 bazoun near Algiers, March, 1844, Durieu (Mo. Bot. Gard. 

 Herb.) ; dry sandy plateaus of Mastapha near Algiers, 7 

 June, 1863, Durieu (Mo. Bot. Gard. Herb.). 

 Sicily: Pantelleria, Favare, April, 1890, Rose (N. Y. Bot. Gard. 

 Herb.); in wet fields, Messina, June, 1907, Ross 800 (Gray 

 Herb.). 



Corsica: pastures, Bastia, 15 March, 1865, Debeaux (Mo. Bot. 

 Gard. Herb.) ; in swampy places, near Bastia, Corsica, 



