exospore


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exospore

[′ek·sō‚spȯr]
(mycology)
An asexual spore formed by abstriction, as in certain Phycomycetes.
References in periodicals archive ?
Spores monolete, ellipsoidal, light brown, (29) 34 (44) x (21) 25 (30) [micro]m; sporoderm 4 [micro]m thick, perispore rugulate, 2 [micro]m thick, with a compact external layer, an alveolar intermediate layer, and a micro-granular internal layer strongly adhered to exospore in young spores, easily detaching in the adult ones; exospore psilate; laesura (12) 16 (18) [micro]m, slightly protruding.
fused to a thin, flat exospore, and an endospore adjacent to the
of the following layers: perispore, para-exospore, exospore, and
separation or "gap" between the para-exospore and the exospore
para-exospore and the exospore is an equatorial-distal separation (Fig.
exospore. An equatorial-distal separation between the paraexospore and
chamber, there are rodlets that show continuity with the exospore coat
Sur la structure fine de I'exospore dans les divers groupes de Pteridophytes actuelles (microspores et isospores).
Eleven character states change on the branch subtending Biscalitheca + Corynepteris: #5, growth form of stem/axis erect [right arrow] rhizomatous; #7, arborescence present [right arrow] absent; #24, scales absent [right arrow] present; #35, protoxylem of stem/axis mesarch [right arrow] exarch; #41, radial rachis/axis trace round-elliptical [right arrow] absent; #57, meio/microsporangium bearing structure unlike vegetative [right arrow] somewhat modified from the vegetative; #61, abaxially attached sporangia absent [right arrow] present; #65, meio/microsporangial grouping absent [right arrow] present; #71, sporangial stalk absent [right arrow] broad; #74, functional annulus absent [right arrow] present; and #88, exospore surface nearly smooth or plain [right arrow] obviously sculptured.
Exospore surface: 0 = nearly smooth or plain; 1 = obviously sculptured.
Micron families can be selectively secreted into the extra cellular environment through exospores [64].