a. 
black-brown and shiny as with melanopoda,and the wall of the sporan- 
geium also with browned cells, of which however most are destroyed 
sclerenchyma cells. ( as it appears to be found only in few apeci- 
mens of "a", 
11. I.melanopoda Leaves with 3 ridges, also sometimes filled 
in front, with 4 strong vascular bundles and indetermined,many small 
accessory on the backside. The 1l1ip below the tonguelet elongated, 
freauently with fuzzy border.Velum small.The sporaneium beauti- 
fully marked by brown sclerenchyma cells. Macrospores small as with 
other species and covered on all levels with small, low,rather den- 
sely packed Mmadd Aindentations.Microspores colored and sheath black- 
brown, specially with the land form. 
12. I. flaccida Shuttler. Submerged with very lonz leaves to 
65 cm. Stomata and vascular bundels present,probably 4; sheath pale. 
Velum totally closed! Sporansgsium small(3 - 4 mm long,3 mm broad) 
without sclerenchyma cells. Macrospores small 0.38 - 0.42 ( for ne- 
lanopoda on the average 0.33 - 0.36) on all planes with low indenta- 
tions, labyrinth-like,covered with hardly net-like,interconnected 
rootlets. Microspores unknown, 
13. 1.Chapmanni A.Br. et Engelm., if you approve, is really dif- 
ferent from "12", The leaves coarser (to 33 cm long) with 4 strong 
vascular bundles. Stomata; the lip below the tonguelet protruding, 
as with melanopoda „ however 1 never saw it turned outward. Velum 
entirely closed I. Sporanzium pale without any sclerenchyma cells. 
Microspores larger than with flaccida, 0.48 - 0.54, not 0.50 - 0.52, 
with few indeyntations on the upper surface (3 - 7) and many on the 
under surface, which are strongly elevated, like the roots of flac- 
cida. of uneven growth, dissimilar form, many elongated and floccose, 
but nevertheless not forming an interconnected root system. Micro - 
spores distinctly humped. This species differs from flaccida primar- 
ly throush larger macrosporeS 
e EEE EEE ic 
3 4 En © 7 8 9 10 MISSOURI 
. BOTANICAL 
(efoJe)igtelai et: 1-1@17-Te GARDEN 
