zoim occur in the brown coals, but no representative of 
the Styracaceae has yet been discovered in the Baltic 
amber. 
Actually in abundance of foliage remains, specimens 
of the Cupressaceae, especially Thuites, exceed those of 
pines (Caspary and Klebs, 1907). Members of the Cu- 
pressaceae are known to be resinous, although they are 
not copious producers. Kirchner (1950) suggested that 
the producers of amber might have been swamp trees 
related to the ‘Tertiary swamp cypress.’’ He presented 
this possibility on the basis of the high frequency of cu- 
pressoid twigs as well as on the presence of aquatic in- 
clusions. The taxonomic discrepancy between ‘“Tertiary 
swamp cypress’’ and ‘‘cupressoid,’’ however, is puzzling. 
I assume that “‘swamp cypress’’ refers to T'axodium, 
which is not a member of the Cupressaceae. Schubert 
(1961) stated that Tavodium generally has not been de- 
tected, and Czeczott did not list this genus in her re- 
vised list of the amber flora. Schubert also pointed out 
that this apparent absence of Taxodium is in contrast to 
the German brown coal floras where remains of both 
Taxodium and Sequoia predominate. Kirchner’s other 
point supporting the possibility of swamp vegetation is 
the large variety of aquatic inclusions obtained from the 
Palmnicken amber mines. Only a few aquatic inclusions 
had been found from the Kénigsberg collections, and 
these were considered to have been incorporated under 
fortuitous circumstances. However, the number and va- 
riety of both fresh water and marine organisms discovered 
at Palmnicken led to the conclusion that, under certain 
conditions, liquid resin must have entered the water and 
thence enclosed these plants and animals. Members of the 
Volvocales, Protococcaceae, Cyanophyceae, and radio- 
larians supposedly were caught in the viscous resin. Dis- 
cophyton electroneion, considered to be a blue-green alga 
[ 255 ] 
