310 The Botanical Gazette. [May, 
the heads: “what are lichens?” “the divisions of lichens;” “the thallus 
“Lichens are a natural order of aerial plants which are considered 
as intermediate between Algze and Fungi, but the limits are still un- 
certain. All are T hallophvtel destitute of stem, leaf, root, or pak 
and vegetate under the influence of moisture, obiainae the elem 
pitiec ahi their growth from the air, and not from their sabieatie 
ot 
“In the thallus are green | cells called gonidia, and other organs, as 
spermogonia and pycnidi 
“The thallus srg gt the apothecium, which is the most important 
part of the: gas 
use. n them snag fanciful a as a8 the eh of Tichens, 
ous or not, 
However grand the Schwendener theory, the pr of autonomy 
i i nee which may event: 
ually change the whole aspect of the 
ican Ee Paton which is said to be nearly complete, about 120 titles 
being cited. 
