19221 -. - n 



PFEIFFER MONOGRAPH OF THE ISOETACEAE 



oped than in /. Boryana and I. tegulensis; sporangia small, 2 

 mm. long, without thickened cells; velum covering 1/3-2/3 of 

 sporangium; megaspores white, 360-440 M, covered with unequal 

 hemispherical warts on the basal face, with smaller more numer- 

 ous tubercles, often inconspicuous, on the apical faces; micro- 

 spores 30 |j long, 20 M wide, spinulose. 



Distribution: small pools in granite plains of Olympus near 

 Brussa of Bithynia. 



Description based on Milde's data. 



15. I. velata A. Br. in Bory & Dur. Expl. Sci. Alg. pi 87. 

 fig. 1. 1846-49; Genn. Comment. Critt. Ital. 103. 1861; A. 

 Br. Monatsber. K. Akad. Wiss. Berlin, 602. 1863; Milde, Fil. 

 Eur. 280. 1867; Franchet, Fl. Loir et Cher, 747. 1885, and Bull. 

 Soc. Bot. Fr. 31: 349. 1884; Motel. & Vendr. Actes Soc. Linn. 

 Bord. 36: 384. pi. 15. jig. 8-9. 1883. 



/. decipiens Bory, Flora 29: 719. 1846. 



/. setacea var. Delilei Bory, Compt. Rend. Acad. Paris 18: 

 1165. 1844, and Flora 27: 716. 1844. 



/. Chaboissaei Nym. Consp. Fl. Eur. 871, name only. 



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



Corm 3-lobed; leaves 5-30, sometimes 40, 8-24 cm. long, ta- 

 pering to apex, rather fine, with wide membranaceous border at 

 base extending y 2 cm. above sporangium level ; base of leaf some- 

 times persisting as a brown papery scale; stomata numerous; 

 peripheral strands usually 6, rarely only 4, frequently with 

 weaker accessory strands in variable number; ligule triangular 

 lanceolate; sporangium 3-5 mm. long, nearly (4/5) to com- 

 pletely covered by velum; megaspores 420 (360) -580 M in diam- 

 eter with few large warts on upper faces (3-10), and with 

 mixed large and small warts on basal face; microspores red- 

 brown, 26-33 (j long, densely spinulose. 



Distribution: Sicily, Corsica, Algeria. 



Specimens* examined : 

 Sicily: near Misilmer, 24 May, 1856, PL Siculae 242 (Huet de 



Pavilion) (Mo. Bot. Gard. Herb.). 



Corsica: near Bonifacio, on granite, rare, April, 1893, Rever- 

 chon (Mo. Bot. Gard. Herb.); Corsica, Rabenhorst Crypt. 

 Vase. Eur. (Reveliere) 105 (N. Y. Bot. Gard. Herb.). 



