1922] 



PFEIFFER MONOGRAPH OF THE ISOETACEAE 107 



almost none; ligule elongated, little shorter than the sporangium; 

 megaspores 300-300 \i and 480-540 n, dimorphous in same spo- 

 rangium, ashy when dry, with white markings ; warts prominently 

 numerous on the basal face, larger and smaller intermixed, on 

 apical faces all small, very numerous ; microspores 30 M long, 20 M 

 wide, somewhat acute, with scattered minute inconspicuous 

 tubercles. 



Distribution: Huilla, District of Angola, Africa. 



No authentic specimens seen. 



2. I. aequinoctialisWelw. in Kuhn, Fil. Afr. 195. 1868; A. Br. 

 Sitzb. Naturf. Fr. Berlin, 7. 1867; Motel. & Vendr. Actes Soc. 

 Linn. Bord. 36: 365. 1883. 



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

 93. 



Corm 3-lobed; leaves numerous, 30-40 cm. long, rigid, firm; 

 stomata numerous; peripheral strands 4 primary and 18-24 

 weaker accessory; ligule elongate triangular, shorter than spo- 

 rangium; velum incomplete, covering l /2-% of the sporangium; 

 sporangium globose ; megaspores dimorphous, 380-480 n and 550- 

 620 M in diameter, cinereous, ornamented by white commissural 

 ridges and warts; warts coarse, hemispherical, distant, some- 

 times doubly confluent, 5-6 on apical faces, solitary or few con- 

 fluent in smaller megaspores ; microspores 30-40 p long, 25-35 p 

 thick, strongly obtuse, densely spiny. Description compiled. 



Distribution: Angola, in wet prairies of Pungo Andago, 

 8-1200 m. altitude. 



3. I. Schwemfurthii A. Br. in Baker, Jour. Bot. 18: 108. 1880; 

 Motel. & Vendr. Actes Soc. Linn. Bord. 36: 380. 1883. 



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

 93. 



Corm 3-lobed; leaves 9-25, 25-32 cm. long, firm, gradually 

 tapering to an acute apex, with membranous margin developed 

 1-3 cm. above level of sporangium; stomata common; periph- 

 eral strands 4 (or 6) cardinal, strongly developed, plus 6-8 ac- 

 cessory groups ; ligule short, broad triangular ; sporangium ovoid 

 to oblong, 4-6 mm. long, with velum none or exceedingly nar- 



