206 BOTANICAL GAZETTE [SEPTEMBER 
3. The power of regeneration may be distinctly localized: a. 
In special cells of the leaf base as in Barbula, Brachythecium, 
and Funaria. 6. In special cells of the ventral leaf surface as 
in Atrichum and Polytrichum. In other cases the power of 
regeneration was quite generally shared by all the leaf cells as 
in Mnium, Bryum, and Phascum. 
4. The structures produced might be all rhizoids in both 
light and dark as in Mnium and occasionally so in Phascum. 
They were protonemata in light and rhizoids in the dark as in 
Bryum, Barbula, Brachythecium, and Phascum, or they were all 
protonemata in both light and dark as in Atrichum and Poly- 
trichum. 
5. Buds were produced under ordinary conditions of cultiva- 
tion only in light in the following: Mnium, Funaria, Bryum, 
Barbula, and Brachythecium. In both light and dark by Atri- 
chum and Polytrichum under ordinary conditions, and by Phas- 
cum when supplied with grape sugar. The production of buds 
seemed to be in a measure dependent upon the food supply. 
6. Regeneration was called forth in all cases by the separa- 
tion of the leaf from the stem. Mere cutting of the leaves while 
in connection with the stem did not call forth the production of 
protonemata or rhizoids. 
7. The majority of moss stems, as well as the leaves, showed 
regeneration, and that in two ways: a. By axillary shoots. 0. 
By protonemata directly or by rhizoids, which in the light very | 
soon gave rise to protonemal branches. The stems in two cases 
had the power of regeneration, while this power was not shared 
by the leaves (Fissidens and Ceratodon). 
8. Production of axillary shoots was not called forth by 
defoliation of the stem, but was generally accelerated thereby. 
In some cases the protonema production was called forth by 
defoliation, in other cases only accelerated. 
g. Protonema production was quite general throughout the 
entire extent of the stem. In some cases the protonemata orig- 
