1922] 



PFEIFFER MONOGRAPH OF THE ISOETACEAE 127 



Isoetes tasmanica F. Muell. in Dur. Bull. Soc. Bot. Fr. 11 : 104. 

 1864. 



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



Corm 3-lobed; leaves numerous and long, flexuous; stomata 

 and peripheral strands lacking; ligule cordate, elongated; spo- 

 rangia dark, practically black with sclerenchyma cells; velum 

 lacking; megaspores white when dry, black when moist, 480- 

 650 p in diameter, marked with minute, very dense tubercles 

 all over surface, confluent into ridges; microspores coffee-brown, 

 (28) 32-35 p in length, densely muricate. 



Distribution : Tasmania. 



Specimen examined: 

 Tasmania: Archer (Gray Herb.). 



This sheet is marked "/. lacustris. Tasmania. Coll. R. C. 

 Gunn." to which Engelmann, Feb. 1880, made note, "Not col- 

 lected by Gunn. Identical with I. elatior F. Muell. Archer legit." 



The megaspores are 570-650 n in diameter, with minute ele- 

 vations above, crinkly in effect, but not anastomosing on the 

 basal face. The microspores range from 28 to 34 p, and are 

 covered with numerous fine spines. The leaves are 1418 in 

 number, about 30 cm. long, and lack a velum. 



Description in part from Braun. 



24. I. Muelleri A. Br. Monatsber. K. Akad. Wiss. Berlin, 541. 



1868; Baker, Jour. Bot. 18: 69. 1880, and Fern Allies, 127. 

 1887; Motel. & Vendr. Actes Soc. Linn. Bord. 36: 389. 1883. 



/. tenuissima F. Muell. (non Boreau) Motel. & Vendr. Actes 

 Soc. Linn. Bord. 36: 389. 1883. 



Calamaria Muelleri 0. K. Rev. Gen. PI. 2: 828. 1891-93. 



Corm 3-lobed, with loose bulb of leaves ; leaves few, 7 cm. long, 

 narrow, attenuate, pale green, diaphanous; stomata present; 

 peripheral strands lacking ; ligule cordate-ovate ; velum complete, 

 closed, pale ; sporangium becoming dark, with all epidermal cells 

 thickened, some light, some very dark ; megaspores 330-390 jj, 

 white or ashy white, marked with less numerous (20-25 tubercles 

 per face) unequal tubercles, even confluent into branching 

 ridges. 



Distribution: Eastern Australia, wet places at Rockhampton. 



