LECIDEA. 



241 



another variety, punctiformis, whose favourite habitat is fre- 

 quently the Scotch fir, the crust is also very thin, and the 

 apothecia flat or convex, but minute and point-like. (E. B. 

 1851 and 2699.) This species is apt to be confounded with 

 others having a similar or an obsolete crust, and black apo- 

 thecia. Its spores vary considerably in characters ; those 

 we have seen are usually oval or oblong, bi-cellular, larger 

 than those of Parmelia parietina, and resembling in general 

 appearance the spores of Ramalina. The protoplasm from 

 which they are developed generally contains a considerable 

 amount of oil-globules. 



7. Lecidea sanguinaria {sanguis or sanguen, blood). 

 Thallus glaucous or whitish-grey, leprose, covered with 

 granules or globules of a similar colour, sometimes aggre- 

 gated into a tartareous crust. Apothecia black, often con- 

 fluent, naked, becoming convex. Thalamium resting on a 

 blood-red stratum (easily seen on section of the apothecium) . 



A common corticolous and saxicolous species in lowland, 

 as well as subalpine districts. It closely resembles the pre- 

 ceding species, from which and others it may always be dis- 

 tinguished by the sub-thalamial red stratum. The spores 

 are large, ellipsoid or elongate-oval, sometimes oblong, with 

 truncate or tapering and horn-like extremities, pale yellow 



