144 
Y. B. Wittrock. 
Hab. in Brasilia ad Lagoa Santa, ubi D:r E. War¬ 
ming legit. Cand. 0. Nordstedt plantam hanc, microscopice 
præparatam, mihi benevole communicavit. 
Our list contains 23 species belonging to the genus 
Oedogonium and 8 species to the genus Bulboclicete\ toge¬ 
ther 31 species. They are distributed in the different 
parts of America in the following manner: 9 are found in 
Greenland, 5 in Pennsylvania, 1 in California, 5 in Mexico, 
3 in the West Indies, 1 in Venezuela, 1 in Bolivia and 7 
in Brazil. It is quite certain, that these 31 species con¬ 
stitute but a small part of the oedogoniaceous vegetation 
of America. Although this vegetation is consequently but 
little known, our knowledge of it may, however, perhaps, 
be large enough to give a considerably high degree of 
probability to some conclusions drawn from a comparison 
between it and the european. The following may be re¬ 
lated : 
l:o. That the oedogoniaceous vegetation of America 
differs upon the whole but little from the european. All 
the american species (perhaps with the exception of 
Oe. obtruncatum Wittr.) belong to types represented in 
Europe. 
2:o. That the vegetation in the part of America si¬ 
tuated farthest to the north, Greenland, is formed by spe¬ 
cies which are perfectly identical with ours from the nor¬ 
thern Europe; whilst the vegetation in parts more to the 
south of America are almost without an exception formed 
by forms which are either species or varieties different 
from ours. Only one of the forms known till now from 
the warmer parts of America is quite identical with a 
european one, namely Oe. crispum (Hass.) Wittr., which 
is, it would seem, a cosmopolitan. 
3:o. That the genus Bulbochcete has, in America as 
well as in Europe, most of its representatives in the cold 
temperate and in the cold zone. Of 8 species known from 
America, 5 belong to Greenland. 
