52 Dr Martius on Antediluvian Plants. 
An Arhoresceni Filicite is distinguished by the following- 
marks : 
An arborescent stem^ without ramifications, or knots, straight, 
of nearly equal diameter, marked all over with areolcR (caused 
by the insertion of the stipes), arranged in a spiral manner from 
the base upwards, and not diminishing in size. Rhombiform or 
oblong areolae^ plane or concave, sometimes variously impressed' 
or tuberculated with rows or lines of tubercles (being the rudb 
menls of the cicatrices of the spiral-vessels). Discrete subreti- 
ciilated spaces or interstices between the areolse. Pinnate or 
compound 
This genus comprehends various species of Lepidodendron^ 
described by the illustrious Count Sternberg ; those, namely, 
which are destitute of true scales, for areolae are not scales, but 
cicatrices engraved in the stem, nor can they be separated from 
each other but by art, and on this account are only divided 
from the internal part of the plant, in being ordinarily converted 
into charcoal, while the latter is changed into stone. It is ne- 
cessary, therefore, to distinguish between areolated plants and 
those which are scaly, which may easily be done, by keeping in 
mind, besides other marks, that scales are imbricated upon each 
other upwards. 
The species of this family with which I am acquainted, are- 
the following : 
1. Filicites quadrangulatus. 
With regularly rhombiform areolae, deeply impressed at the 
base, the thin interstitial spaces similar. 
Palmacites quadrangulatus. ■ Schlotheim, die Petr^acten- 
hunde^ auf ihrem jetzigen Standpuncte^ p. 395. n. 7. pi. 18; 
. fig. 1. 
Of the older coal formation, from the coal mines of Opperoda^ 
in the dukedom of Anhalt, and of Manebach^ in the duke- 
dc^m of Gothe. Scloth. 
It corresponds with the stem of Polypodmm corcovadenst, 
figured by Naii^ pi. 3. 
% Filicites tesselatus. 
With rhombiform areolae^ having acute angles, the upper 
