Equisetum × moorei Newman (1854: 19)

Ferrer-Gallego, P. Pablo, Laguna, Emilio & Rosselló, Josep A., 2017, Typifications of the Linnaean name Equisetum hyemale and E. × moorei (Equisetaceae), Phytotaxa 305 (2), pp. 104-110 : 106-108

Equisetum × moorei Newman (1854: 19) , pro. sp.

Type (lectotype, designated here):—[ IRELAND]. On sea shore near Rockfield, Co. Wicklow, D. Moore, 1849, DBN (no. 004737) ( Fig.2 ).

Concerning the name E. ×moorei , a complete description of this plant is included in the protologue ( Newman 1854), together with other remarks related to its discovery, its ecology and a account of the main features discriminating other species, especially E. hyemale . The geographical locality is also indicated “ Hab. Clay-banks facing the sea at Rockfield, County Wicklow, Ireland; found by Mr. Moore, in company with Professor Melville, of Queen’s Collegue, Galway ”, and herbarium material as “Herb. Moore, Newman, & c.”.

We have found three relevant herbarium sheets collected in the locus classicus cited in the protologue “Rockfield, County Wicklow ” in Ireland. In the herbarium of the Natural History Museum ( BM) there is a sheet containing several complete stems and a label “ Equisetum moorei Newm. Coast of Co. Wicklow / W. D. Moore /1858” (image available at http://plants.jstor.org/stable/history/10.5555/al.ap.specimen.bm001066238). However, this material was collected post-1854 and therefore it is not suitable for a lectotypification. We have been unable to trace further original material in the BM herbarium.

In addition, in the Moore’s collection in the herbarium of the National Botanic Gardens at DBN there are two herbarium sheets that contain material identified as E. × moorei and collected in 1849. The sheet DBN (with no. 004723) bears a complete plant and a label “Morii / Equisetum / E. Wilsoni [strikethrough] / on the sea shore at Rockfield / Co. Wicklow 1849”, and the sheet DBN (with no. 004737) bears two well preserved plants and an original label handwritten by Moore “ Equisetum moorei Newm / on sea shore near Rockfield / Co. Wicklow / 1849 / D. Moore” ( Fig.2 ).

In our opinion, the sheet DBN (with no. 004737) in the Moore’s collection can be considered as a syntype according to Art. 9.5 of the ICN (in the protologue was cited the geographical locality, the collector, and specimens as “Herb. Moore”), and therefore is designated herein as the lectotype of the name E. × moorei . This specimen shows the main diagnostic characters of E. × moorei (e.g., slender stems, with some teeth of leaf–sheaths persistent, and the length/width ratio of the leaf sheets is c. 2 or more) and represents the traditional concept and current use of the name E. × moorei (e.g., Newman 1854, Hauke 1962, 1963, Tutin 1964, Pétrement et al. 2012, Jepson et al. 2013, Feoktistov & Gureyeva 2016, Kalinowski et al. 2016).

Figures

FIGURE 2. Lectotype of Equisetum ×moorei Newman (DBN, with no. 004737). Photography by courtesy of the herbarium DBN; reproduced with permission.