ee 
äf Engelmanni and Perahardi's Gerber from the same locality. 
10. I:Engelmanni Stomata, 4 vascular bundles, short velum,spo- 
raneium not without 'sclerenchyma cells, small macrospores with long- 
ish ridges, abundance of leaves, 2-part grooving (?),this, however, 
of many-shaped kind. It will be necessary to distinguish a nunber of 
varietles, 
a. Normal Form, large and long-leaved, Leaves with stronly pro - 
truding side-rims, strong vascular bundles and velun, small velum be- 
low licrule (B. uses "Scheide" = sheath) and sporangium pale, the latter 
without or nearly without sclerenchyma. 
b. valida even larger and broader leaves on the front part with 
a blunt keel (German:sstunpfer Kiel, E.D.), velum developed somewhat 
ee || 
stronger,microspores with stronger,tiny indentations, otherwise as a. 
c. infirma the opposite of "b",thus leaves weaker,flat in front. 
Side ridges present ‚weakly, the 4 vascular bundles very weak,sporan- 
gja short (with "a" and "bp" long). Velum very small, microspores with 
nearly visible indentations. (No or only few lisht-browm sclerenchyma 
cells). Brook emptying into Mystic Pond West Cambridge. Oct.26 and 
Nov. 5,1865 Boott. 
d. angsustifolia In all parts smaller, fewer leaves, the smaller 
leaves with nearly blunt, not protruding side-rims. Velum very small. 
Sporaneium pale,without or with a few weakly colored sclerenchyma 
cells. Otherwise like "ce", only the vascular bundles are probably 
stronger. Wilmineton (Canby). A similar form from New Haven (Baton 
and Herb. Hooker). 
e. forma terrestris As I see from my papers, I have not yet re- 
searched this sufficlently, Trom wilminston. 
f. a forma submersa of which you sent me a small piece, I did not 
touch due to insufficient material. 
&. fuscata similar to the normal form, but the velum below ligule 
7 8 9 10 MISSOURI 
| . | Ton W.UNuKey.Si 
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