A CEYLON ISOETES. 355 



latter I. hrachyglossa. He is followed by Baker in his useful 

 Synopsis published in this Journal two years ago. According to 

 this test the Ceylon plant would best fall under the latter ; but I 

 am inchned to think there is but a single Indian species, especially 

 as in my fresh specimens I observe considerable difference in the 

 length of the ligule. In dried specimens the characters are very 

 difficult to determine. 



The following references to localities may be given : — 



Isoetes coromandelina, Linn, f., Suppl. Plant., p. 447 (1781). 



Eoxb. in Calc. Journ. Nat. Hist. 1844, p. 470. Baker in 



Journ. Bot., 1880, p. 109. 

 Coromandel, 1774, Kmnig in Hb. Mus. Brit. ! (= J. indica ms.). 



Circar mountains, appears in rainy season, Roxbun/h. Near 



Madi-as, Wir/ht, Hb. propr. Crypt, no. 4 ! and Hb. Wight, no. 



309 [vide Baker I. c). Dambulla, Ceylon ! 



Under which may be included : — 



7. hrachyglossa, A. Braun in Verb. Brandenb., 1861-2, p. 328; 

 Baker, I. c, p. 109. 1. capsidaris, Griff., Notulse ii., p. 572 

 and Icones ii., tt. 116-118 (non Eoxb.-). 



Serhampore, Griffith in Hb. Kew ! I have seen no other 

 specimens. 



Koenig was the original finder of this sj)ecies, but his ms. name, 

 " I. indica," was never published. His ticket gives the locality 

 "in locis humidis submersis raro; " he adds, "radices incolis 

 esculentae." In his valuable MSS., preserved in the British 

 Museum, he gives a fuller description and the habitat, " ad mar- 

 gines stagnarum tempore pluvioso submersos satis frequens." 

 Wight says, (ms. note in Herb. Kew), " I have repeatedly found 

 this plant in moist soil near Madras during the cool season ; " he 

 does not mention it as being submerged. 



Desceiption of Plate 23i. — Isoetes coromandelina, L. f. 1. Cellular 

 structure of the leaf. 2. Section of the rhizome. 3. Inner surface of the base 

 of the leaf, showing the sporange and ligule. 4. Side view of leaf, with sporange 

 and ligule. 5. Section of base of leaf and of a sporange. 6. Fresh macrospores. 

 7. Dry macrospores. 



* Roxburgh's specimens in the British Museum are obviously Vallisneria 

 spiralis, and were long ago so labelled by Dryander; his drawing at Kew also 

 (says Baker I. c.) represents that plant. The ligure however in Calc. Journ. I. c, 

 t. 26. though poor, is correct ; this may have been supplied by Griffith, who 

 edited that posthumous paper. 



