In " Zwei deutsche Isoeten" 1862 you speak of 6 american 
species, then you quote Iacustris, Braunii, riparia, Engrelmanni,and 
florida: what was the 6th, melanonoda was not yet known at that 
Pius 1 IV), Ber nase ara Abe saxteriaive'but 
| RAR a F 
Ansufficient description of Isoetes Malinyeasi ana, , Linee says 
Line 30 p.844 smacrosporae numerosae tertiem milliantes partem dia- 
metro aequatum.- Of the Isoetes from Sardinla you say 0.78-0.92 mm, 
the larrest, which you mention. How does that rhyme ? (2) 
Iam going again throush these questions posed in April and 
may repeat myself, but that does no harnm. 
E. Tuckerman (not mann !) lives in Amherst, Massachusets, 
has geivan me the most exacting localitiesof the Mystic Ponfl Isoe- 
tes, at which Boott found last year and this year I. Braunii. 
Now I received also a tiny specimen of the plants from Sault 
de Ste Marie; only three exist, one of Forter, one of Durien, and 
mine. It is the plant from Pobo Lake; microspores entirely like 
those of I. lacustris from Europe; macrospores larger;without any 
doubt = macrosperm Durien hut only a form of lacustris. Porter, 
Leidy and Smith found the plants together. 
ra” 
E72 
185 _ 
Soult de Ste Marie Hegat the contraction of Lake Superior 
where it transfers into Lakes Michigean and Huron; this Isoetes is 
in an analogrue place on the Niagrara River (between Lakes Erie and 
Ontario), the other I. Braunii ! 
With Mann, Howe, .... you now correspond. I found now the 
ola KHichter Cliinton I. Braunii in the Catskill Mountains, but not 
macrospora - thus both are there, just like the cousins in the Black 
Forest; The Catskill Braunii has much loneer leaves than the other 
forms and seems to make a transition to I.muricata. 
You must have, as I wrote recently, the same oririnal spe- 
cimen of I.muricata (Aurust 1860 ?) from me.- May-be Boott threw 
K 
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