which have lareser and here and there elongated indentations, 
which by the way are more sparsely present on the upper surface. 
14, I. Nuttallii mihi Subterrestial, leaves with 3 rims as 
with melanospora ,„ with 4 vascular bundles. Cuticula strong, velum 
entirely closed ( as for "12" ana "13". ) Jin. not elongated, : There 
seem to be stripes of sclerenchyma cells in the wall of the spo- 
rangeium. Macrospores 0.39 - 0.48, not 0.42 - 0.46 rather dense on 
all surfaces, covered with small, dark protruding indentations, 
which are never elongated in a root-like manner,which distingui- 
shes this species distinctly from "12" and "13". Microspores with 
hardly identifyable tiny humps. (the intendations of the macro- 
spores are much smaller and more numerous than for Chapmanri, 
more similar therein to melanopoda, but raised-up more and more 
densely sifuated) .Columbia R (Nuttal and Herb. Hooker subnom«s I. 
opaca ) Gamass-prairie or Coeur D'Alene (C.A.Geyer and Herb.Hoofker). 
15. I. pygmaea A. Br. and Engelm, if you approve, or would you 
rather leave this species for mehnd take the following for you 
alone ? Belongs really at the beeinring next to I.campestris. 
I do not have anything new to add to what I reported earlier. 
Differs from "16" by the lack of stomata and throush the macro- 
spores. Microspores dense and short srike-like. 
8, IT.Bolanderi Engelm. or A.Br. and Enselm. really to be put 
aloneside ambigua and saccharata. Differs from the preceding one 
by a longer velum. I have not seen any microspores, As you have 
seen them, prepare a note about their appearance. I would much 
desire a little more material of "15" and " 16*. I.Bolanderi can 
be compared with flaccida and I. pygmaea with melanopoda as far 
as the character of the macrospores is concerned. 
AL 16 named american forms have 2-lobed rhizomes,whereas 
there are only 2 species with 2-lobed rhizomes known from the Old 
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