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Abstract
The embryological development of Erigeron speciosus DC. — The Author refers on the embryology of Erigeron speciosus DC. listing the most important characteristics of the development of this gametophyte
a) a pluricellular archesporium is formed, with fertile and sterile cells.
b) several mother cells develop inside a single nucellus leading to the formation more than one gametophyte;
c) at the end of the meiotic process different conditions may be reached; that is: tetramegasporial apocitium; II) trimegasporial apocitium plus a megaspore; III) dimesporial apocitium plus two megaspores at the two ends of the apocitium;
d) the gametophyte may vacuolate with different patterns.
e) different types of development may occur in the gametophyte, that is: I) from tetrasporic cell of a 16-nucleate gametophyte with a monosporial oangium; II) from trisporic cell of a 12-nucleate gametophyte with a monosporial oangium; III) from disporic cell of a 8-nucleate gametophyte with a monosporial oangium.
f) Erigeron speciosus has a cromosomic set of n = 9.