18 REVUE BRYOLOGIQUE 
As for plants these observations have, however, hitherto ex 
tended only to phanerogams. It has even, strangely enough, 
as for whät I know, only once before been proposed, to wit 
by doctor À. Pokorny (1), to extend the observations also 
to cryptogams ; but these saummons appear to have led to no 
purpose, probably because the proposal was made in too va- 
gue terms. It must, however, of course be as important to 
examine cryptogams as phanerogams with respect to their 
phænological relations. ne see à it would be very impor- 
tant to find wether the laws, existing for phanerogams, 
are followed also by cryptogams, or, if this be not the 
case, what differences these may display in this respect. 
It is from these reasons, that I dare to the readers of 
Revue Bryologique, renew the summons, already issued 
by doctor Pokorny, as far as they refer to mosses, and 
summon to simultaneous phænological observations on 
these plants, the more as mosses, on account of the wide 
distribution of some of their species, are still better adapted 
to such observations than phanerogams ; and, because it in 
observations of this kind is necessary that all observers 
agree on a common plan, lest the observations of different 
observers may become fully comparable to each other, I dare 
at the same time give an account of the plan according to 
which I have believed that these observations would be ar- 
ranged with the greatest profit. 
As it is especially the blooming and the fructification 
that have been made the objects of observation in phanero- 
gams, it were highly desirable that the same phenomena 
were observed also in mosses. The blooming is, to be sure, 
not fully so well adapted to phœænological observations in 
mosses, as in phanerogams, Loue it only through very 
toilsome and time-wasting researches by means of the 
microscope is possible to determine the precise day atwhich 
a moss begins to bloom ; I believe, however, that it will 
prove to be of such importance to learn the time of blooming 
of different mosses in different parts of the world (2), that I, 
neverthless, dare propose observations on the blooming of 
mosses : but äs it would be connected with too much labour 
to fix the days of blooming as nicely in mosses, as in phane- 
rogams, we must perhaps in mosses be contented with dates 
that denote the day of blooming only approximatingly, 
_ which dates are, on the contrary, very easily won, as I know 
(1) A. Pokorny : « Ansichten über Beobacht an to= 
gamen (in Jæhrbücher der K. K. Central-Anstalt fr Meteorologic 
etc., in Wien. Band 8. Anhang). 
(2) In this respect 1 besides refer to the summons already before 
issued by E. Roze in Revue Bryologique, 1874, pag. 2-3. 
