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SPlLOMA tuberculosa.
Warty Spiloma.
CRYPTOGAM1A Alga.
Gen* Char. Receptacles shapeless, without a border*
powdery, in an uninterrupted crust.
Spec. Char. Cru st calcareous, greyish-white. Receptacles
scattered, somewhat confluent, unequal,
elevated, granulated, black.
DISCOVERED by Mr. William Robertson of Newcastle, on
Sandstone rocks in that neighbourhood, as well as in various
parts of Northumberland and Durham, where it is far from rare.
“ Mr. Turner has determined it to be Certainly a Spiloma, and
quite new.” We without hesitation accede to this determination.
The crust is uninterrupted, running closely over the stone, but
of a calcareous nature, greyish-white externally, s but internally
green when cut or rubbed, as in many Lichens. Receptacle*
sessile, not immersed, copiously scattered over the surface,
various in size, often approximated or confluent, consisting of
black tumid granulations, intermixed with some appearance of
a grey powder. When cut vertically they are internally green
like the crust.
2SS0