File:EB1911 Endospora - Stages in spore-formation.jpg

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Summary

Description

English: Stages in spore-formation. All the figures are from Myxobolus ellipsoides, except a and f, which are from M. pfeifferi.

a, Differentiation of the pansporoblast (p.sp).

b, Pansporoblast with two nuclei.

c and d, Pansporoblasts with six and ten nuclei respectively; in d, four of the nuclei are degenerating.

e, Pansporoblast segmented into two definitive sporoblasts, each with three nuclei. In the next four figures the definitive sporoblast, or the spore produced from it, is alone figured.

f, Definitive sporoblast segmented into three masses, the capsulogenous cells (c.g.c) and the sporoplasm (sp.p), within an envelope, the spore membrane (sp.m).

g, More advanced stage.

h, Spore completely developed, with two polar capsules and sporoplasm containing an iodinophilous vacuole.

i, Abnormal spore containing six polar capsules.

n, Nuclei.

sp.bl, Definitive sporoblast.

r.n, Residuary nuclei.

vac, Vacuole.

r.p.c, Rudiment of p.c, polar capsule.

n.p.c, Nuclei of polar capsules.

iod.vac, Iodinophilous vacuole.

n.sp, Nuclei of sporoplasm.

Date

published 1911

Source

“Endospora,” Encyclopædia Britannica (11th ed.), v. 9, 1911, p. 385, fig. 4.

Author

From Lankester’s Treatise on Zoology, vol. Protozoa, after Thélohan.

Permission
(Reusing this file)

This image comes from the 13^th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:41, 28 August 2018		810 × 421 (82 KB)	Bob Burkhardt	{{Information \|description ={{en\|1=Stages in spore-formation. All the figures are from ''Myxobolus ellipsoides'', except ''a'' and ''f'', which are from ''M. pfeifferi''. ''a'', Differentiation of the pansporoblast (''p.sp''). ''b'', Pansporoblast with two nuclei. ''c'' and ''d'', Pansporoblasts with six and ten nuclei respectively; in ''d'', four of the nuclei are degenerating. ''e'', Pansporoblast segmented into two definitive sporoblasts, each with three nuclei. In the next four figu...

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