that, as I am convinced, only in comparatively few cases is the color
unchanged during the life-history of a given fructification. It may
sometimes change from hour to hour as development proceeds. The color
designated in the descriptive pages of this work is presumably, unless
as otherwise set out, that immediately preceding that of the maturing
fruit.

As suggestive, and as, it is hoped, contributory to better knowledge of
this phase of our subject a list of species is here subjoined as
presented by my colleague, Professor Morton E. Peck of Oregon, who has
given unusual attention to this particular investigation.

SPECIES PLASMODIUM COLORS

_Physarum sinuosum_ light grey, nearly white, ivory white

_Physarum serpula_ greenish-yellow; yellow

_Physarum virescens_ pale greenish-yellow; yellow

_Physarum cinereum_ watery grey, becoming white; pallid

_Physarum didermoides_ watery grey, becoming white; blue-white

_Physarum notabile_ pure white

_Physarum globuliferum_ greenish-yellow; yellow

_Physarum leucopus_ light grey

_Physarum pulcherrimum_ dark red

_Physarum flavicomum_ greenish or brownish yellow

_Physarum viride_ clear yellow

_Physarum wingatense_ at first grey, then pure white

_Badhamia orbiculata_ pale yellow, passing to white

_Physarella oblonga_ brilliant yellow

_Mucilago spongiosa_ watery grey, then white

_Didymium crustaceum_ white

_Didymium squamulosum_ pale grey, watery white

_Diderma floriforme_ grey tinged with yellow

_Stemonitis fusca_ white passing through blue to black

_Stemonitis smithii_ green to yellow to reddish purple

_Comatricha longa_ white, cream-yellow, reddish purple
to dusky

_Comatricha irregularis_ white

_Comatricha nigra_ white

_Comatricha typhoides_ bluish white

_Diachaea splendens_ pure white

_Enerthenema papillatum_ colorless or greenish

_Reticularia lycoperdon_ white

_Dictydiaethalium plumbeum_ colorless, pink, salmon, rose, orange,
chocolate brown

_Lindbladia effusa_ brown, lead-colored

_Tubifera ferruginosa_ watery white, scarlet, brown,