I have copied Dr. Greville’s specific character and description,
and refer to his excellent figure in the ‘ Scot. Crypt. Flora.’ The
“ tubercles ” above described arc evidently young ceramidia ; the
specimen having been collected just as they were putting forth.
It is obvious from an inspection of the figure that they are
metamorphosed ramuli, occupying exactly the position of ramuh.
They are profusely scattered over all the branches of the specimen
I examined.
Fio- 1 P o l y s i p h o n ia s p in u l o s a -— the natural size. 2 . A branch. 3 . A
small branch and ramuli, with apical fibres and young ceramidia. 4 Gross
section of one of tlie smaller branches. B. Cross section of the stem :
all more or less Ughly magnijied.