otherwise Duvier may cross the path, who holds back with any worth- 
while information despite repeatedly pronounced promises. I have not 
even been able to obtain one original of his muricata ,„ which he 
has promised me many times dry and alive. Formerly I sent himvall 
Isoetes for viewing, but won't do so in the future,as I have become 
convinced that he is not capable to examine the Iso@tes thorouehly. 
AI1 I expect from him is a nice presentation of the spores of all 
species in pictures if it ever comes to such a publication, which 
seems to be held back so long, because he wculd like to produce 
more but is not able to do so. I have shared with him even of late 
the spores of many species to encourage him to fulfill his promises. 
Now to our project. 
A clear spearation of sections, as practiced by the stoics 
of the old world,can not be applied to the northamericans. Not even 
the separation by presence or abserce of peripheral bundles can be 
achieved, as the fibers may be reduced to a minimum; which can hard- 
ly be found; and I cannot decide despite all efforts defiritely, with 
those dried specimens if such a minimum is present.or not, 
1. I. lacustris var.macrospora Nothinze can be found which would 
4ustify a specific differntiation from the euröpaean species. In 
the herbarium of Hooker only "Brit.N.America,Drumond" with spores, 
which are at the boundary of the common lacustr. and macrospora. 
2. I. canadensis a dubious interface between I. lacustris and 
riparia . The material is insufficient and very poor. The specimens 
x t 
reported by you are "David A.P.Watt. mübhı Dec.1865" without fur- 
ther detail where found, formerly auestionably designated by you as 
_ 
riparia, later auestionably desirenated as Engelmanni var. ?. Young 
plants, 2 glued with long leafstalks ( ? E.D.),2 smaller ones,not 
glued with short,smaller leaves and sparsely fruiting.I do not find 
any stomata und would desigenate the plant without reservation as 
6 / “ 9 10 
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