46 DR. NYLANDER ON GONIDIA AND THEIR DIFFERENT FORMS. 
and genera. Of so great importance, indeed, is tins anatomical 
apparatus, that the gonimia put on the most diverse forms where 
the external aspect of the Lichen is but little or scarcely at all 
changed.” 
The following are the principal forms which we find in Gonidia 
and Gonimia. There is, also, to be added Gonidiniiay which are 
intermediate between them. 
A. Gonidia (or Eugonidia). 
1. Haplogonidia. — A very frequent protococcoid form, constitu- 
ting a globulose (or subglobulose) cellule, which is simple, or 
twice or thrice divided. There occur, indeed, in certain species 
(especially in Lecideas with granuloso -leprose thalli) glomerulose 
gonidia, with several small agglomerated gonidia, which are often 
more notable than chroolepoid gonidia. Elsewhere there are 
observed haplogonidia which are variously connated, and passing 
into the following form. 
2. Platygonidia, or platygonidic syngonidia. — Such are the 
depressed gonidia variously membranosely connated, as are pre- 
sented by certain epiphyllous thalli (Cfr. Nyl. Lich. Andam., 
p.l3). 
3. Chroolepogonidiay or chroolepoid gonidia. — These are they 
which are more or less similar to Chroolepus, and which when 
simpler pass into simple gonidia. They are often of a violet 
scent, 
4. Confervogonidia, or Confervoid gonidia. — These in a certain 
way imitate the Confervse. They constitute the princq^al element 
of the thallus of the Coenogonii. 
B. Gonidimia. 
These (in the “ Flora,” 1866, p. 116) I have also called Lepto- 
gonidia, but the name gonidimia appeared to be preferable, as 
being shorter and more conformable to the others. They are 
intermediate between Gonidia and gonimia^ smaller than the 
former, and having the parietal cellules less distinct, and the form 
otherwise oblong. To this pertains also hymenial gonidimia. Not 
rarely gonidimia are found (f.^., in Verrucaria cethiobola) aggre- 
gated in syngonidimic glomeruli, and then on a passing inspection 
they scarcely differ from gonimia, unless in the greenish colour. 
C. Gonimia. 
These, whether occurring in thalli or cephalo lia, present the 
same characters. Their colour is glaucous-bluish. A peculiarity 
is that they are not endowed with any cellular wall, but that there 
is only present superficially a very thin vesicle difficult to be dis- 
tinguished, which, when superfused with ammoniac, is seen empty, 
in consequence of the phycochromatic contents being thus dis- 
solved (Cfr. Nyl. Obs. Lich. Pyr. Or., p. 48). 
The forms here to be distinguished are chiefly the following : — 
