The Fern Gazette Volume 20 Part 4

Published 15th December 2016


Edited by M. Gibby & A. Leonard


MAIN ARTICLES

Decaploid gametophyte formation from spores of a pentaploid Cystopteris fragilis (Cystopteridaceae) collected in Mongolian Altai
S.M. Kawakami, S. Kawakami, O. Damdinsuren, J. Kato, S.V. Smirnov & K. Kondo pg(s) 149-155
ABSTRACT
Germinating spores were obtained from a pentaploid Cystopteris fragilis collected in Mongolian Altai. DNA content of nuclei in gametophytes showed for the first time that gametophytes that developed from spores of the pentaploid sporophyte had a larger number of genomes than those of the mother sporophyte, and some appeared to be decaploid. Fertile decaploid (10n) spores may be produced in the pentaploid C. fragilis and derived from monad spores observed in sporogenesis. Antheridia were produced on the 10n gametophytes, although antherozooids with swimming ability were not observed. Archegonia were not observed. Apogamous sporophytes with 10n genome content were induced from decaploid gametophytes. The monad spores produced may contribute to the formation of higher polyploid sporophyte series in ferns.

Two new records for colombia of Psilotum nudum (Psilotaceae) from the Magdalena Valley and in the Andean Amazonian foothills
D. Sanín & V. Torrez pg(s) 157-162
ABSTRACT
Despite its wide distribution, Psilotum nudum has been recorded previously only from the western slopes of the Occidental Andean Cordillera of Colombia, particularly in the Chocó Region, and in the Caribbean Golf of Urabá. As a result of recent exploration, we here expand the distribution of P. nudum in Colombia by reporting two new records from the Central and Oriental Andean Cordilleras.

SHORT NOTES

Two updates for Grammitid ferns (Polypodiaceae) on the ‘Ferns of Thailand’ website
B.S. Parris pg(s) 156

Two new combinations in Grammitid ferns (Polypodiaceae): Prosaptia hornei and Radiogrammitis setulifera
B.S. Parris pg(s) 163-164

BOOK REVIEW

Fern names and their meanings – 2nd Edition. J.W. Dyce, revised and expanded by J. Edgington. 2016.
Reviewed by T. Pyner pg(s) 165-166
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