Xanthidium fasciculatum var. burchardtii, W. W. A. Kow, 2024
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publication ID |
https://doi.org/10.24917/25438832.9.2 |
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persistent identifier |
https://treatment.plazi.org/id/03B1FF33-9909-FF97-E789-9ABE5587FB12 |
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treatment provided by |
Felipe |
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scientific name |
Xanthidium fasciculatum var. burchardtii |
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Xanthidium fasciculatum var. burchardtii W.W.A.K. var. nov.
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W
Wojciech
Description: cells elliptical in outline, much wider than long, lg.: br. 0.81–0.86×; dimensions without spikes lg. 54.3–55.2 µm, br. 66.7 µm, isth. 19.8 µm wide, deeply narrowed, app. 29.2 µm. Dimensions of spine cells: lg. 69.2–74.1, br. 84.6–86.5 µm. Linear sine, expanding in the outer part. Elliptical semi-cells, strongly flattened at the top of the apical part, with angularly rounded sides. Each half-cell is equipped with 6 pairs of straight, long 13.0–14.6 µm spines at the corners, mounted on the edges of the rounded corners. The central part of the half-cells with circular ornamentation in the form of a clear uplift, 13.0 µm in diameter in the apical part, about 7.6–7.0 µm high, made of distinct, regularly embedded granules; 4 in the central part, surrounded by 10 granules on the outer circle. On the outer edges of the central ornamentation of the half-cells, on the top side there is a clearly marked wavy presence of 5 granules. At the base of the half-cells, closer to their outer part, there are short extensions about 2 µm long directed towards the sinus. Viewed from the top, the cells are elliptical, with almost flat and parallel sides and rounded ends. In the central part there are half-cells with a clear ornamental circular uplift. In this part, the cells are 33.0–34.0 µm thick, with almost parallel wall sections 20.0 µm thick. There are visible spines on the apical surface, placed in 4 semi-cells at the rounded ends and 2 pairs symmetrically in the central part. Additionally, at the ends of the half-cells, single spines are placed alternately. The cell wall is very delicately dotted.
Habitat: in the benthos among other species of desmidia in open aquatic depressions in the Carici limosae‑Sphagnetum cuspidati Hueck 1925 (= Drepanoclado fluitantis‑ ‑Caricetum limosae (Kästner et Flössner, 1933) Krisai, 1972) phytocoenosis complex ( Jasnowski, Jasnowska, 1982) dominated by Sphagnum cuspidatum Ehrh. ex Hoffm. with a large share of Batrachospermum turfosum Bory , pH range 5.7–6.1. Oligotrophic habitat of moss bogs, in benthos together with other desmidia.
Distribution in Poland: Taxon not yet recorded in phycoflora.
General distribution: The distribution and occurrence of the taxon unknown.
Type: Fig. 1 View Fig Ba and Bb.
Remarks: In a review of the primary algological literature ( West, West, 1912; West, Carter, 1923; Krieger, 1939; Forster, 1982; Hirano, 1957, 1959; Palmar-Mordvintseva, 1982, 2005; Coesel, 1994; Crosdale, Flint, 1988; Lenzenweger, 1997, 2003; Kossinskaja, 1952), no cells with such morphological features were recorded. No such variation was recorded in the study by Kanetsuna, Yamagishi (2018) regarding Desmidia from Southeast Asia.
Some of the cells characteristics refer to Xanthidium fasciculatum Ralfs var. oronense West & West. A common feature of this variety is the presence at the base of the half-cells, closer to their outer part, of rounded outgrowths about 2 µm long, directed towards the inner side of the half-cells. They differ from the cells of this variety and the nominal species in slightly larger dimensions, both in length and width, and in shape. Important features that distinguish the taxon are the form of central ornamentation and the presence of single alternating spines, clearly visible from the top of the half-cells. They are located very symmetrically in the central part between the pairs of apical and marginal spines. The central ornamentation of the half-cells consists of 14 oval granules, arranged in two circles, 10 of which regularly surround the 4 in the centre. The shape of the half-cells is also different, they are elliptical in outline and much wider than the long ones, lg.: br. 0.81–0.86×. The nature of the accompanying phycoflora indicates a taxon associated with a mesotrophic habitat.
new
taxa
for
the
desmidia
crux-melitensis
flora
from
Ehrenberg
wetland
var
.
ecosystems
multispinosa
To present the morphological differences between both described varieties, the original documentation for the species is provided below ( Fig. 2A–C View Fig ).
of
W
.
Western
W
.
A
.
Kow
Pomerania
.
var
.
nov
.
,
Poland
and
Xanthidium
fasciculatum
Ehrenberg
ex
Ralfs
var
.
The author declares no conflict of interest related to this article.
| W |
Naturhistorisches Museum Wien |
| A |
Harvard University - Arnold Arboretum |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.