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268 ZYC;.\HMATACEAE
PLATE XII
ZVGOGONIUM, PlLURODISCUS, MoLGhOTIOPSIS, AND DiBARYA
Figs. 1-5. Zygogoniutn sincnsc, zygospores, vegetative cells, partheno-
spores, lateral conjugation, and resulting zygospore; also remnants of
sporangium wall after escape of zygospore; details of spore wall. Figs. 6-
8. Z. exuvielUjorme, zygospores formed by lateral and scalaritorni con-
jugation, and details of spore wall, from Colombia, South America. After
Jao. Figs. 9-11.—Z. plaf{ountiosporum, zygospores formed by lateral and
scalariform conjugation. Note bilateral asymmetry of spore wall markings
from Colombia, South America. After Jao. Figs. 12-15. Pleurodiscus
borinqmnae , vegetative cells with disc-shaped chromatophores; zygospores
and details of sporangium and spore walls from Puerto Rico. .After Tirfany.
Figs. 16-17. Mougeotiopsis calospora, vegetative cells with chromatophores
in different positions; zygospores with characteristic deep pits in the spore
wall from Latvia. After Skuja. Figs. 18-19. Debarya glyptosptrma,
arched gametangia and zygospores from Sweden. Figs. 20-21. D. acl{lcy-
ana, face and side views of zygospores from Michigan. Figs. 22-23.—D.
costata, zygospores in face and side views from Fyzabad, India. Figs. 24-
26.—D. polyedrica, zygospores and gametangia from Yunnan, China. After
Skuja. Figs. 27-28. D. smithii, vegetative cell and mature zygospore;
lower figure shows growth of the two chromatophores and the multiplica-
tion of pyrenoids during the early stages of conjugation, from Fresno,
California. Figs. 29-30.—D. hardyi, conjugating gametangia and immature
spore; cannot be placed in this genus with certainty until mature zygospores
are lound.