1922] 



PFEIFFER— MONOGRAPH OF THE ISOETACEAE 109 





rounded, and occasionally cross- wrinkled ; microspores fawn- 

 colored, 31-36 m, lightly reticulate, with ridges spine-like in sil- 

 houette. 



Distribution: British Guiana. 



Specimens examined: 

 British Guiana: pools by shore of Mazaruni River, Demerara, 



December, 1800, Jenman (N. Y. Bot. Gard. Herb.), type; 

 Baracarra, Mazaruni River, Demerara, December, 1890, Jen- 

 man (N. Y. Bot. Gard. Herb.). 



4. I. Heldreichii Wettst. Verh. K. K. Zool.-Bot. Ges. Wien 

 36: 239-240. pi. 8. 1886, whence the following description: 



Corm 3-lobed, 3-6 mm. long, 3-7 mm. broad ; leaves 3-8, fine, 

 flexuous, green, smooth, 10-25 cm. long; no peripheral strands 

 or rarely one dorsal; no stomata; ligule obovate-acute, very 

 finely and irregularly cut; sporangia 4-6 mm. long, without 

 velum; megaspores 14-36 in number, creamy white, globose, in- 

 conspicuously trigonous, about 660 p in diameter, warty [plate 

 shows 12 or so warts on one of upper faces] ; microspores pow- 

 dery, elliptical, with narrow winged margin, and marked with 

 short spines. 



Distribution : Greece, plains of Thessaly. 



Specimen examined: 

 Greece: amphibious in wet places, schistose substratum, in lower 



region of Pindus Mountains, alt. 3500 ' , 5 July, 1885, Held- 

 reich 899 (Gray Herb.). 



5. I. coromandelina L. fil. Suppl. PI. 447. 1781; A. Br. 

 Verh. Bot. Ver. Brandenb. 4: 327. 1862; Motel. & Vendr. Actes 

 Soc. Linn. Bord. 36: 380. pi. 15. fig. 7. 1883. 



/. brachyglossa A. Br. Verh. Bot. Ver. Brandenb. 4: 327. 1862. 

 /. capsularis Griffith, not Roxb., in Posth. Papers, Cryptog. 

 PI. 572-575. pi. 116-118. 1849. 



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

 93. 



Corm 3-lobed; leaves 20-60, large, with very wide membra- 

 nous wings at base, extending above sporangium level; stomata 

 numerous in upper region, lacking in basal portion of leaves; 

 peripheral strands present, 4 very strongly developed with sev- 



