PDF - CES (IISc)

LICHEN ALGAE 57
Coccomyxa subellipsoidea is given 1 as the gonidium of the primitive
lichen Botrydina vulgaris (Fig. 25). The cells are surrounded by a common
gelatinous sheath.
Fig. 24. Coccobotrys Verrucariae Chod.
from culture x 800 (after Chodat).
Fig. 25. Coccomyxa subellipsoidea Acton.
Actively dividing cells, the dark portions
indicating the chloroplasts x 1000 (after
Acton).
5. DiPLOSPHAERA Bial. 2 D. Chodati was taken from the thallus of
Lecanora tartarea and successfully cultivated. It resembles Protococcus^ but
has smaller cells and grows more rapidly ; it is evidently closely allied to
that genus, if not merely a form of it.
6. IJROCOCCUS Kiitz. Cells more or less globose, rather large, and
coloured with a red-brown pigment, with the cell-wall thick and lamellate,
forming elongate strands of cells (Fig. 26). Recorded by Hue 3 in the
cephalodium of Lepolichen coccopkora, a Chilian lichen.
Fam. TETRASPORACEAE. Cells in groups of 2 or 4 surrounded by a
gelatinous sheath.
i . PALMELLA Lyngb. Cells globose, oblong or ellipsoid, grouped without
order in a formless mucilage (Fig. 27). Among lichens associated with
Palmella are the Epigloeaceae and Chrysothricaceae.
Fig. 26. Urococcus sp. Group of cells
much magnified (after Hassall).
Fig. 27. Palmella sp. x 400 (after Comere).
2. GLOEOCYSTIS Naeg. Cells oblong or globose with a lamellate
sheath forming small colonies ; colour, red-brown
(Fig. 28).
found by
This alga along with Urococcus was
Hue in the cephalodia of Lepolichen
coccophora, but whereas Gloeocystis frequently occu-
pies the cephalodium alone, Urococcus is always
accompanied by Scytonema, the normal gonidium
of the cephalodium.
1 Acton 1909.
Fig. 28. Gloeocystis sp. x 400
(after Comere).
- Bialosuknia 1909. Hue 1905.