Ascospores brown, unicellular, ellipsoid-inequilateral, with broadly rounded ends, (7.1)7.9-9.0(9.6) x (3.3)3.5-4.2(4.4) [mu]m (N= 60, Me= 8.5 x 3.8 [mu]m); with straight germ slit spore-length on the convex side; perispore dehiscent in 10% KOH, smooth with a thickening on the convex side; epispore smooth.
Ascospores brown, unicellular, ellipsoid-inequilateral, with broadly rounded ends, (6.3)6.6-7.8(8) x (2.8)3.1-3.5(3.7) [mu]m (N= 40; Me=7.1x 3.3 [mu]m); with straight germ slit spore-length on the convex side; perispore dehiscent in 10% KOH, smooth with a thickening on the convex side; epispore smooth.
Taxa Size of spore and Germination Filamentous perispore
surface in days fase (days) Blechnum 37(41)49 x 24(27)31 6-10 2-5-cells- appendiculatum [micro]m [+ or -] long, cells 2, slightly cylindrical reticulated (14-20) perispore
with small granules B.
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.
A multivariate morphological-anatomical analysis of the perispore
in Aspleniaceae (Pteridophyta).
section, the wall, from outside to inside, is composed of perispore,
The perispore sculptural elements are varied: cones, echinae,
surface and of the perispore structure provide characteristics useful
perispore and a para-exospore, which are two different layers with
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].