194 NEW LICHENS. 
centre; nor is the border of the apothecia thin, shining, 
and at length evanescent ; nor is there any blackish-brown 
matter beneath the lamina proligera. 
2. C. maritimum, Tayl.; thallo pulvinato, gelatinoso-mem- 
branaceo, olivaceo, marginem versus glaucescenti, lobis 
minutis, imbricatis, rotundatis, margine incrassatis, un- 
dulatis, subintegerrimis, convexis, minute rugosis; gem- 
mis majoribus granulatis; apotheciis confertis, minutis, 
immersis, disco flavescenti-brunneo. 
Has. On limestone near the sea; Dunkerron, county of 
Kerry.— Patches 1-3 inches wide, when moistened nearly 
one inch high, when dry flat, thin and membranous. 
Lobes cgncave beneath, the marginal distinct, the central 
cohering, all of them minutely wrinkled and covered with 
punctiform elevations, which at the edge of the disks of 
the apothecia cause the margins to appear crenulate. The 
- substance of the thallus contains numerous, filiform, moni- 
_ iate, slightly waved bodies : such as are observable in several 
species of Collema, and are made by some botanists to 
characterize the genus Nostoc. The disk is dark yellowish- 
brown, pruinose with elevated points; the lamina pale 
_ brown, thickly striated, resting on a thin concolorous 
. layer, which, however, is more opaque. This is by far 
the most gelatinous species known. 
3. C. reflexum, Tayl.; thallo foliaceo, crasso, albido-glauces- 
centi, minutissime ruguloso, subtus fusco, tomen 950 
