1922] 



PFEIFFER — MONOGRAPH OF THE ISOETACEAE 125 



20. I. Drummondii A. Br. Monatsber. K. Akad. Wiss. Berlin, 

 593. 1803, and 542. 1868; Baker, Jour. Bot. 18: 70. 1880, and 

 Fern Allies, 128. 1887; Motel. & Vendr. Actes Soc. Linn. Bord. 

 36: 319. pi. 13. fig. 4-5. 1883. 



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

 Corm 3-lobed; leaves 18 or fewer, 3-7 cm. long, somewhat 

 loosely arranged, coarser than /. Muellerii and /. tripus, bright 

 green ; stomata present ; no peripheral strands ; ligule very short, 

 cordate-triangular; sporangium rounded, without sclerenchyma 

 cells; velum lacking; megaspores whitish when dry, dark brown 

 when wet, 310-470 u in diameter, marked with numerous (36-40) 

 minute tubercles, distinct on apical faces, sometimes confluent in 

 meandrinif orm ridges on basal face ; microspores 30-39 p long, 

 violet-ashy, short denticulate-muricate. 

 Distribution: Australia: Swan River. 

 Specimens examined: 

 Australia: wet rocks, Toodyay, coll. O. W. F. (N. Y. Bot. Gard. 



Herb.) ; Tea Tree Gully, South Australia, 13 October, 1917, 

 Osborn (Mo. Bot. Gard. Herb.); National Park, Belair, 

 27 September, 1917, Osborn (Mo. Bot. Gard. Herb.) ; 

 Echunga, South Australia, 1 September, 1921, Osborn (Mo. 

 Bot. Gard. Herb.). 



The plants of the first collection were small, consisting of 5 or 6 

 fine leaves, about 3 cm. long, bearing sporangia 2-2.5 mm. in 

 length, without velum. The megaspores were 360-470 u in diam- 

 eter, chiefly 430 n, and showed rather close anastomosing rid- 

 ges on basal face. The microspores, densely spinulose, 32-39 u 

 in length, were brown in the mass, with a violet cast. 



21. I. amazonica A. Br. ace. Kuhn in Martius, Fl. Bras. I 2 : 647. 

 pi. 19. jig. 5-6. 18S4; Baker, Jour. Bot. 18: 109. 1880, and Fern 

 Allies, 133. 1887; Motel. & Vendr. Actes Soc. Linn. Bord. 36: 351. 



1883. 



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



Corm 3-lobed; leaves 10-12, 5-7 cm. long, somewhat rigid; 

 stomata and accessory peripheral strands present; ligule short, 

 triangular; sporangium small (2-2.5 mm.), lacking velum ; mega- 

 spores white to ashy, 430-510 u in diameter, with numerous 



fluent into verrucose ridges; microspores 33 



40 u, finely tuberculate 



