Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)

Authors

Frithjof A.S. Sterrenburg
Myriam D. De Haan, Botanic Garden Meise
Wulf E. Herwig, Freidingstrasse 11
Paul E. Hargraves, Harbor Branch Oceanographic Institute at Florida Atlantic University

Document Type

Article

Date of Original Version

6-13-2014

Abstract

Gyrosigma tenuissimum (W.Sm.) J.W.Griffith & Henfr. was examined in the original material and an emended description is presented. Its protologue contains an error of taxonomic significance: in the type material, the valve and raphe sternum do not show the considerable flexure described and illustrated in Smith (1853). A comparison with Gyrosigma coelophilum N. Okamoto & Nagumo revealed that the latter, although similar in several characters, differs sufficiently in others to warrant separate specific status. Descriptions of two new taxa are given: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. Both show very fine longitudinal striae at or beyond the limit of ordinary light microscopy and are practically non-sigmoid. © 2014 Magnolia Press.

Publication Title, e.g., Journal

Phytotaxa

Volume

172

Issue

2

Citation/Publisher Attribution

Sterrenburg, Frithjof A., Myriam D. De Haan, Wulf E. Herwig, and Paul E. Hargraves. "Typification and taxonomy of Gyrosigma tenuissimum (W. Sm.) J.W. Griffith & Henfr., comparison with Gyrosigma coelophilum N. Okamoto & Nagumo and description of two new taxa: Gyrosigma tenuissimum var. gundulae var. nov. and Gyrosigma baculum sp. nov. (Pleurosigmataceae, Bacillariophyta)." Phytotaxa 172, 2 (2014). doi: 10.11646/phytotaxa.172.2.2.