perispore


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perispore

a spore membrane.
References in periodicals archive ?
section, the wall, from outside to inside, is composed of perispore,
The perispore sculptural elements are varied: cones, echinae,
The perispore has high echinae in spores produced by I.
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.
sprucei have a venulose, rugulate perispore close to the type shown by species of the B.
surface and of the perispore structure provide characteristics useful
These authors described a lacunose perispore, a para-exospore partially
of the following layers: perispore, para-exospore, exospore, and
Perispore forming elaters: 0 = absent; 1 = present.
This multilayered tapetum does not develop plasmodesmata at the pollen mother cell stage but the cell walls break down successively in the layers of tapetal cells, discharging protoplasm into the locule, where it is not enclosed by a perispore membrane [ILLUSTRATION FOR FIGURES 19-23, 34, 35 OMITTED].
A perispore membrane occurs in Tradescantia (Commelinaceae, [ILLUSTRATION FOR FIGURE 8 OMITTED]).
As in Tradescantia (see above), a perispore membrane, a typical feature of plasmodial tapeta (visible in TEM), occurs in Anigozanthos (Haemodoraceae, [ILLUSTRATION FOR FIGURE 15 OMITTED]) and was also illustrated in Xiphidium (Haemodoraceae) by Simpson (1989).