272 BOTANICAL GAZETTE [octosEr 
than finely granular, is chinky or subareolate and not so distinctly 
sorediate as the thallus of Amphiloma. This unknown thallus seems 
also to resemble that of Urceolaria scruposa in microscopic structure, 
but it is not so well developed. This lichen is a very conspicuous 
feature of the society and is common toward the basal, damp ends 
of the riprap extensions, especially the eastward two. _ It also extends 
upwards to the upper end of the extensions, but in passing upward 
is confined more and more to the damp sides and crevices. 
showing thalli of the 
Fic. 2.—Blocks of riprap at the side of one of the extensions, 
Amphiloma-like lichen. 
IV. TYPES OF THALLI REPRESENTED. 
: er ; ei ain the 
As to types of lichen thalli in the society, we have in the m 
rudimentary type with leprose or finely granular surface and ae 
of cortex, and the fruticose cylindrical type with pri 
strengthening pseudocortex of mostly parallel and gir ae 
hyphae. Other. types, as the foliose and the areolate oF a jcu- 
corticate-crustose forms, appear but rarely and do not — : gen 
ous portion of the society. The first type of thallus © ue us. 
by the first two lichens of the list, and by the Amphiloiie a ied to 
The first, Biatora myriocar poides, was doubtless the first 
