20 REVUE BRYOLOGIQUE 
better to get numerous dates of few species, than few dates of 
many species. Besides, I have, in making choice ofthe mos- 
ses, here underneath proposed as objects of observing, tried 
to get mosses : 
- that through their wide distribution may be common to 
observers in the most distant countries ; 
- that are easily recognized lest they may not by any ob- 
server be confounded with other species ; 
that I have found to have a more limited time of their 
blooming and fructification ; 
- that, as far as possible, represente very different part of 
the year, as it is important to examine what variations the 
phænological laws are subjected to according to different 
seasons ; 
* that in their blooming and fructification are at least in 
Sweden contemporary with many kindred species, by which 
means at the same time, as the time of blooming and 
fructification in different regions of the world become known 
in the proposed ies, this time is at least approxima- 
tingly indicated also to their contemporaries in Sweden, as 
mosses that are contemporary in Sweden, must be supposed 
with very great probability to be contemporary also in other 
countries ; or finall 
‘the blooming and fructification of which in Sweden 
exhibit any extraordinary peculiarities ; as for which it 
were interesting to find wether they exist also in other 
countries. Among the mosses that Ï have chosen chiefly 
from the last reason I dare in the first place call attention 
to Dicranella cerviculata and varia, the former of which, 
as well as also D. heteromalla, subulata and curvata, 
“blossoms in Sweden about the 1° of September and ripens 
its fruits first 16-19 months after the blooming, whe- 
reas D. varia, as well as the remaining Swedish species of 
Dicranella, blossoms about midsummer, but ripens its 
fruits already 6-8 months after the blooming ; to Hypnum 
crista castrensis, that blossoms in Sweden in the former 
halfth of August and requires 16-21 months for the forma- 
tion ofits fruits, this species and Hypnum purum thus being 
the only pleurocarpous mosses in Sweden that require more 
“than a year for the formation of their fruits ; to Aulacom- 
nion palustre, Tetraphis pellucida, Polytrichum commune and 
nee that require in Sweden at least 13 months for the 
formation of their fruits ; to Dicranum undulatum and fus- 
cescens that require even {7 months for the formation of 
their fruits and, besides, bloom at different seasons in dif- 
ferent parts of the Scandinavian peninsula, in the midst of . 
Sweden a little before the first of August, in more northern 
parts of Norway in June, etc. à 
