appearance. Moreover, as to this plant, I hardly think 
that the suppression of the sexual cells can in every 
case be regarded as sufficient proof in deciding this 
question. As to the pollen, I have examined a great 
number of flowers, and I was sometimes surprised to 
find the pollen-grains all alike and very well developed. 
Their condition, however, is rather variable ; yet I have 
not seen any anther with all grains deformed or abor- 
tive. The best ones were found on different plants 
from Ben Lawers 1911, and there were anthers which 
had emptied themselves perfectly. Even in S. saginoides 
I have seen a pollen of a certain irregularity. 
My statement above that all seen specimens from 
different habitats are identical, should be understood 
to mean that they are the same plant on macroscopic 
examination and in their outward appearance. Time 
will prove, whether they really all belong to the bastard: 
procunibens X saginoides , or rather have a different ori- 
gin in spite of the conformity and apparent identity. 
Perhaps they are not all of them a hétérozygotie com- 
bination: yet, as matters now stand, it is most likely 
that they have such an origin. 
The plant in question, Sagina media Brügger, taken 
as a proper species, and regarded in its whole geogra- 
phical distribution, may thus comprehend some not equi- 
valent forms. Nevertheless, in the majority of cases it 
shows a striking uniformity and as sharp limits as both 
of the presumptive parents, procunibens and saginoides 1 ). 
Provided that it has a hétérozygotie origin, we must not 
9 Sagina procunibens, as well as S. saginoides , show slight 
modifications in size of leaves and flowers, thickness of stem and 
peduncles, and length of capsule (see fig. 4). They are distinguish- 
ed by the ripe capsule, which in procumbens is but a little 
longer than the sepals, but nearly twice as long in S. sagi- 
noides. and surrounded with spreading sepals in the former, but 
wit-h erect ones in the latter. As long as the capsules are unripe, 
