Macbride: Mountain Myxomycetes 
149 
Turning now to the Puget Sound collections, it is to be noted 
that we have from both Oregon and Washington less than a 
dozen physarums, three didymiums so far and only three or four 
didermas, and these not abundant. On the other hand cribrarias 
are on every log, and although the number of species of Trichia 
or Hemitrichia is not large, the number and extent of their 
colonies is surprising. T. decipiens and T. botrytis are the com- 
mon types, but neither is like forms of the same species as pre- 
sented in the central parts of the continent. They are in every 
case larger ; they open in sharply circumscissile fashion, standing 
in colonies often several feet in extent. T. botrytis, if such it be, 
is not quite Persoon’s species, it is not botryoid at all. I have 
never seen so many as two sporangia adhering. Later on, the 
large empty vases of both species stand long, quite like those of 
Hemitrichia clavata. 
But robust comatrichas and lamprodermas are the striking 
features of the myxo flora about Puget Sound. These are every- 
where ; lamprodermas at sea-level and comatrichas on the moun- 
tains; on Mt. Rainier up at the last limit of the firs, 8-9,000 ft., 
I found] C. nigra (Pers) Schr. and especially C. snksdorfii Ell., 
beautiful and abundant sepcimens. Stemonitis species are few 
and rare ; the colonies feeble when found, except at low levels 
where at least two species occur, but not S', splendens R. 
At 7,000 ft. Arcyria vitellina Phill. particularly the form A. 
versicolor occurs in wide colonies of large sporangia, twice the 
size of those seen in Colorado. A. versicolor, is olivaceous yellow 
with touches of dull red. A. vitellina, pure yellow, is in Colorado 
and Southern California. 
But the lamprodermas of the Mt. Rainier neighborhood are, as 
just stated, all a surprise. They all merit Ellis’s name robusta, 
and their far stretching colonies all gleaming in marshalled and 
metallic splendor are beautiful to behold. 
In fine, not to prolong this argument, so far as present knowl- 
edge goes, the slime-mould floras of the two mountain regions 
named are distinct as the mountains themselves. Dominants and 
recessives no doubt play their respective parts, but meteoric en- 
vironment ultimately casts the die. 
University of Iowa, 
Iowa City. Iowa. 
