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The Fern Gazette Volume 19 Part 5

Published 18th October 2013


Edited by M. Gibby & A. Leonard


REVIEW

A new classification of the gametophyte development of homosporous ferns, focusing on meristem behaviour
R. Imaichi pg(s)141-156
ABSTRACT
Different shapes of fern gametophytes may be the result of adaptive evolution to different habitats where the gametophytes grow. In homosporous ferns, gametophytes are cordate-thalloid (terrestrial) in many taxa but can also be strap-like, ribbon-like, and filamentous (epiphytic) or tuberous (subterranean) in other taxa. Recently developed long-term observational techniques of the same individual gametophyte during growth have led to a new classification of development types for planar gametophytes. We recognise five basic types (Lygodium, Elaphoglossum, Anemia, Colysis, and Vittaria). The five types reflect different combinations of the three meristems: apical cell-based, marginal and multicellular meristems. In the Lygodium-type, the apical cell-based meristem is immediately followed by the multicellular meristem phase, resulting in typical cordate gametophytes. In the Elaphoglossum- and Anemia-types (i.e. subtypes of the Lygodium-type) strap-shaped and asymmetric cordate gametophytes, respectively, are formed. In the Colysis-type, the marginal meristem phase occurs between the apical cell-based meristem and the multicellular meristem phases, and in the Vittaria-type, the multicellular meristem phase is absent. In both of these latter types, irregularly branched ribbon-like gametophytes form.

A short biography of Ryoko Imaichi pg(s)157

MAIN ARTICLES

The genus Adiantum L. from Maharashtra: a note on the addition of two species for Maharashtra, India
Sachin Patil, S. Patil & M. Dongare pg(s) 159-163
ABSTRACT
The genus Adiantum L. from Maharashtra is revised; seven species are recognized. Adiantum concinnum Willd. and A. poiretii Wikstr. are new records for Maharashtra, and are described and illustrated.

Glaziou’s pteridophyte collection at the Paris herbarium
G. Cremers & M. Boudrie pg(s) 165-180
ABSTRACT
During our work on pteridophytes for the ‘Flora of the Guianas’ programme, we have examined specimens from numerous herbaria, and especially from Paris (P). We have realised the importance of Glaziou’s collection which is deposited at P. The detailed study of this collection led us to point out the difficulties of interpretation of dates and localities given on the labels of this collection. Therefore, for the benefit of further users of this collection, a complete inventory is being carried out. Examination of the collection catalogue, specimens, literature and associated databases has allowed the comparison of the labels and establishment of the chronology of the specimens and of the sites of collection. We have also studied Appun’s collections from Guyana; these specimens were given by Appun to Glaziou, who incorporated them within his numbering. This paper presents the preliminary results of our study. However, after some five years of works for the installation of compactors for the Paris herbarium collections, and including mounting, digitising and re-curation of the pteridophyte specimens, these are once more accessible for research and all specimens will need a new revision.
RÉSUMÉ
Lors de nos travaux sur les Ptéridophytes pour le programme ‘Flora of the Guianas’, nous avons examiné les spécimens de nombreux herbiers, et plus spécialement celui de Paris (P). Nous avons ainsi remarqué l’importance de la collection d’A.F.M. Glaziou déposée à P. L’étude de détail de cette collection nous a permis de constater les difficultés d’interprétation des dates et des lieux de récolte portés sur les étiquettes des spécimens de cette collection. Aussi, pour le bénéfice des utilisateurs ultérieurs de cette collection, en avons-nous entrepris un inventaire complet, actuellement toujours en cours. L’examen des carnets de récolte, des spécimens, de la bibliographie et des bases de données nous a permis de comparer les étiquettes et d’établir la chronologie des spécimens et des lieux de récolte. Cet article présente les résultats préliminaires de notre étude. Toutefois, la collection de l’herbier de Paris nécessite une nouvelle révision, du fait des travaux de rénovation de l’herbier, tous les spécimens étant désormais accessibles. Nous avons également étudié les récoltes d’Appun du Guyana. Ces spécimens ont été donnés par Appun à Glaziou qui les a intégrés dans sa numérotation.

Equisetum × sergijevskianum, a hybrid horsetail from Siberia
C.N. Page & I.I. Gureyeva pg(s) 181-190
ABSTRACT
A new hybrid of Equisetum L. – Equisetum × sergijevskianum C.N. Page et I.I. Gureyeva (E. palustre L. × E. pratense Ehrh.) – was described originally from herbarium material found by the authors in 2007 in Krylov Herbarium (TK, Tomsk State University). E. × sergijevskianum is the first new hybrid in Equisetum to be first found in Russia. Presented here is an expanded study in English, giving diagnostic features of this hybrid, comparison with parental species and other hybrids in Equisetum subgenus Equisetum, and discussion of distribution and ecology of the parental species. This hybrid occurrence endorses that this parental combination can exist, and we suggest that this hybrid could consequently occur elsewhere within the widely-sympatric portions of the circum-boreal ranges of the two parent species, which includes northern Europe, and especially perhaps Scandinavia and northern parts of the British Isles.

BOOK REVIEWS

Ferns, Clubmosses, Quillworts and Horsetails of Cornwall and the Isles of Scilly. Murphy, R.J., Page, C.N., Parslow, R.E. & Bennallick, I.J. 2012.
F.J. Rumsey pg(s) 191

The website of the British Pteridological Society