The Fern Gazette Volume 19 Part 4

Published 29th April 2013

Edited by M. Gibby & A. Leonard


Recent advances in the understanding of fern responses to light
M. Wada pg(s) 97-115
Fern gametophytes are a good model system to study cell biology and photobiology. Because they are very sensitive to light, have a very simple structure, either linear or two-dimensional, and are not covered with any other tissue, manipulation and observation of cells are quite easy compared with three-dimensional vascular plant tissues including fern sporophytes. Therefore many experiments to investigate phenomena common to both ferns and seed plants, while not possible using higher plant tissues, have been conducted in fern gametophytes. However, in spite of the irreplaceable characteristics of gametophytes, not many people work on the system these days. Recent advances in fern photomorphogenesis using gametophytes are summarised in this mini-review on photoreceptors for photomorphogenesis, and chloroplast and nuclear photorelocation movement under red and blue light. Finally the fern specific technique of gene silencing by DNA fragments is described.

A short biography of M. Wada pg(s) 116


Morphological studies of Equisetum × rothmaleri (E. arvense × E. palustre, Equisetaceae, Equisetopsida) in Finland
M. Lubienski & V. M. Dörken pg(s) 117-134
The hybrid between Equisetum arvense and E. palustre, E. × rothmaleri, was found in Finland. Its macromorphological features are presented and compared with material from the type locality in Scotland. For the first time the micromorphology of the hybrid is presented through SEM images and compared with that of several other hybrids within subgenus Equisetum. Based on Finnish and Scottish material, a revised table of characters is presented and the problem of reliable determination of the hybrid in the light of the high morphological variability of E. arvense is discussed.

Archigrammitis, a new genus of grammitid fern (Polypodiaceae) from Malesia and Polynesia
B.S. Parris pg(s) 135-138
Archigrammitis, a new genus of grammitid ferns (Polypodiaceae) is described from Malesia and Polynesia. The genus has some characteristics of Prosaptia – dorsiventral rhizomes with stipes articulated to phyllopodia and ciliate rhizome scales, but the rhizome scales are concolorous, rather than clathrate, as in Prosaptia. It also has setose sporangia, with simple eglandular hairs at the apex adjacent to the annulus, a character seen in Oreogrammitis and Radiogrammitis, but not in Prosaptia. New combinations are made for A. demissa (Parris) Parris, A. friderici-et-pauli (Christ) Parris, A. marquesensis (Parris) Parris, A. ponapensis (Copel.) Parris, A. samoensis (Baker) Parris and A. tahitensis (C.Chr.) Parris.
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