CRYPTOGAMIA Algae.
G e N . C h a r . Male, scattered warts. Female, smooth
shields or tubercles, in which the seeds are imbedded.
S p e c . C h a r . Crust powdery, pale ash-coloured. Shields
flattish, deep yellow, with a yellow border.
S y n . Lichen luteus. Dicks. Crypt, fasc. 1 . 1 1 . t. 2 .
f . 6. Ach. Prod. 42. With. v. 4. 25. Hidl. 292.
Parmelia lutea. Ach.Meth. 179.
T h i s is a rare and little-known species. It was collected
by Mr. Turner in a wood near Bangor. Mr. Dickson, its first
describer, has observed it on the mossy trunks of trees. In
Mr. Turner’s specimens it grows on the bark itself.
The crust is mealy, sometimes very thin and scattered; sometimes
more dense, and in that case green within. Its colour
externally is a pale grey or ash-colour. The shields are numerous,
rather small, sessile, with a flattish smooth disk of a
full yellow, more verging towards the orange than the lemon.
Their border elevated, more or less deeply coloured like the
disk.
Dr. Acharius in his new Metkodus Lichenum observes, that
he does not doubt his plant being right, though he finds the
shields smaller than in Mr. Dickson’s figure. Our specimens
confirm the accuracy of his remark ; but we can also spe.ak to
the correctness of that figure, the shields being, as we apprehend,
larger in proportion as the crust is more dispersed, from
growing on moss instead of bark.