224 KLOKA 01-- THE EAST RIDIXG <)E YORKSHIKE. 



1927. isoetes lacustris. /:/«//., 25. 



Incognit. 



Riccal Common (W.N.C.); "o\v probably extinct, but 

 as the next species has been re-discovered recently in abun- 

 dance, so also Isocfes may be still present. 



MARSILEACE.^. 



1930. Pilularia g-lobulifera. Lijm., 59. 



Native, Brit., 7. Late Summer. 



Skipwith Common (W.N.C.); formerly in ponds now 

 cleared away. Discovered ag^ain in j^reat abundance in other 

 ponds bv Mr. H. J. Wilkinson, Oct., igoi. Specimens /;/ 

 herb., J.'F.R. 



CHARACE.^. 



1 93 1, Chara frag'ilis. Desv., 84. 



Native, Brit., 1-7. Sprinij- and Summer. 



Common in staj^^nant ponds and dykes. 



1935. L. polyacantha. Bmun.. 13. 



Native, Eni;;-., 6. Sprinj^ and Summer. 



Rare. Staddlethorpe, 1878 (H. R. Moiser). 



1941. C. hispida. /./////., 46. 



Native, Eng., 6. Sprint^ and Summer. 



Rare. Pond in old marl pit, Market Wei^hton, April, 

 1899.* 



1942. C. vulgaris. /./////., 76. 



Native, Brit., 1-7. Sprint,'- and Summer. 



Very common in the dykes of all the districts. Var. 

 papillata, Wallr. (H.F.P.). Other vars. not yet determined. 



