exospore


Also found in: Medical, Encyclopedia, Wikipedia.

ex·o·spore

 (ĕk′sō-spôr′)
n.
1. The outermost layer of the wall of certain spores.
2. An asexual spore developed externally by budding, as from a sporophore.

exospore

(ˈɛksəʊˌspɔː)
n
(Botany) the outer layer of the spores of some algae and fungi
ˌexoˈsporous adj

ex•o•spore

(ˈɛk səˌspɔr, -ˌspoʊr)

n.
the outer coat of a spore.
[1855–60]
ex`o•spor′ous, adj.
Translations
exospore
Mentioned in ?
References in periodicals archive ?
Mature spores have a dense exospore coat, a pale endospore, and single rows of 8-11 polar tubule coils (Figure 2, panels B, C).
Perispore is microrugulate with rugulae homogenously distributed; it is adhered to exospore in young spores but tends to detach; detaching usually begins at the laesure zone in mature spores.
Micromorphology of outer exospore coatings in Selaginella megaspore.
4 urn in length and were characterized by an outer electron-dense exospore and a thick electron-lucent endospore.
The outer exospore is then covered by the perispore.
These changes are: #20, quadriseriate branching of axes/leaves absent [right arrow] throughout; #28, stele with radiating arms of xylem absent [right arrow] as rounded lobes; #41, radial axis/rachis trace round-elliptical [right arrow] lobed; #46, position of protoxylem in rachis/axis toward no face [right arrow] toward several faces; and #88, exospore surface nearly smooth or plain [right arrow] obviously sculptured.