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Dehiscence of antheridia in thelypteroid ferns
Author(s) -
Tigerschiöld Eva
Publication year - 1989
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1989.tb01019.x
Subject(s) - antheridium , biology , dehiscence , spermatid , botany , anatomy , sporangium , sperm , spore
The manner of antheridial opening was investigated in 18 species of the family Thelypteridaceae by scanning electron microscopy. Four different types have been observed: 1) An irregular rupture in the cap cell wall. 2) A rounded opening like a pore. 3) The cap cell being totally thrown off. 4) Opening at one side like a lid, with the cap cell still being attached to the ring cell on the opposite side. Although it has been claimed that the manner of dehiscence is specific to different species, no evidence for this view was found. In 9 of the 18 species studied at least two manners of opening occurred. In 7 of the 18, three or four occurred. In the majority of cases male gametes are in the spermatid stage at time of release from the antheridium. Later on the slimed cell wall dissolves and the spermatozoids are liberated. In a few cases this process is more or less completed within the antheridia, so that spermatozoids are mature already at the time of release.