360 TRANS. ST. LOUIS ACAD. SCIENCE. 



1850. A. W. Chapman found in Northern Florida a peculiar 

 /soeies, which proved to be a large-spore form o{ I. Jiaccida^ and 

 was named var. Chapmani. 



1853. E. Hall discovered in his fields near Athens in Central 

 Illinois the species which was afterwards named by J. Gay I. me- 



LANOPODA. 



1856. I found /. echinospora^ var. Brau7iii^ in Lake Winni- 

 piseogee in New Hampshire, the type of I. Braunii, Durieu. 



1857. E. D. Eaton obtained /. Engebnanni for the first time 

 in the New England States. 



i860. Wm. Boott found near Boston the form of /. echino- 

 spora, which was named from his specimens I. muricata by 

 Prof. Durieu, the present /. echinospora var. muricata. 



1862. Th. C. Porter discovered near Lancaster, Pa., the largest 

 American Isoetes, I. Engelmanni, var. valida. 



In the same year G. Vasey found /. melanopoda in Iowa. 



1863. I. Macoun obtained /. echinospora., var. Braunii., in 

 West Canada. 



In the same year Wm. M. Canby discovered in Maryland I. 



SACCHARATA. 



1865. Leidy and Porter collected /. lacustris near the outlet 

 of Lake Superior. 



In the same year 1. Tuckermani was rediscovered near Bos- 

 ton by Wm. Boott. 



1866. Chs. Wright discovered I. Cub ana in Eastern Cuba. 

 In the same year H. Bolander found two new species in the 



Sierra Nevada of California, I. Bolanderi and I. pygm^a. 



1867. Wm. Boott got near Boston the species named after him 

 I. BooTTii. now known as /. echinospora., var. Boottii. 



1869. Wm. M./ Canby discovered on the Stone Mountain in 

 Georgia the curious little I. melanospora. 



In the same year S. Watson found /. echinospora., var. Brau- 

 nii., in Utah. 



1 87 1. E. Hall gathered beautiful specimens of /. Nuttallii 

 on the Columbia river. 



1872. The same traced /. melanopoda to Texas. 



1873. T. P.James got /. echinospora, \nr. Braunii, in Nova 

 Scotia and C. C. Parry found /. Bolanderi in Yellowstone lake 

 in Wyoming. 



