A COMPARATIVE-STUDY OF GAMETOPHYTE MORPHOLOGY, GAMETANGIAL ONTOGENY AND SEX EXPRESSION IN THE ASPLENIUM-ADIANTUM-NIGRUM COMPLEX (ASPLENIACEAE, PTERIDOPHYTA)
C. Prada et al., A COMPARATIVE-STUDY OF GAMETOPHYTE MORPHOLOGY, GAMETANGIAL ONTOGENY AND SEX EXPRESSION IN THE ASPLENIUM-ADIANTUM-NIGRUM COMPLEX (ASPLENIACEAE, PTERIDOPHYTA), Annales botanici Fennici, 32(2), 1995, pp. 107-115
Spores from two diploid taxa, Asplenium onopteris L, and A. cuneifoliu
m Viv., and two allotetraploid taxa, A. adiantum-nigrum L, var. adiant
um-nigrum and A. adiantum-nigrum var. silesiacum (Milde) Viane & Reich
stein, were cultured in three different types of soil. Except for A. c
uneifolium, the spores germinated after ten days. The general pattern
of development for the gametophytes was similar in all four taxa, foll
owing the Aspidium-type. We found that the length and density of margi
nal hairs differ at the specific level. The formation sequence of the
gametangia studied in the three Iberian taxa was the same, and is inde
pendent of the soil type. Our results indicate that the spores in this
group of taxa are able to germinate and develop mature gametophytes i
n different kinds of soil, and that they can produce sporophytes.