Micrasterias crux-melitensis (Ehrenb.) Hassal. ex Ralfs var. multispinosa W.W.A.Kow., 2024
|
publication ID |
https://doi.org/10.24917/25438832.9.2 |
|
persistent identifier |
https://treatment.plazi.org/id/03B1FF33-990B-FF91-E78E-9E2A548CF9FF |
|
treatment provided by |
Felipe |
|
scientific name |
Micrasterias crux-melitensis (Ehrenb.) Hassal. ex Ralfs var. multispinosa W.W.A.Kow. |
| status |
var. nov. |
Micrasterias crux-melitensis (Ehrenb.) Hassal. ex Ralfs var. multispinosa W.W.A.Kow. var. nov.
Description: cells circular in outline, almost as long as they are wide, lg.: br. 0.89–1.07×; lg. 110.0–112.4 µm, br. 102.8–125.3, 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. In terms of form, size and shape, the cells have a morphological form characteristic of the taxon, which does not differ from the nominal species and its previously registered varieties and forms.
The top patch and the marginal patches of the first and further orders are shaped in accordance with the diagnostic descriptions presented in the literature ( West, West, 1905, 1912; Krieger, 1939; Forster, 1982; Hirano, 1957, 1959; Palmar-Mordvintseva, 1982, 2005; Coesel, 1994; Lenzenweger, 1996, 2003; Kossinskaja, 1952; Roll, 1924, 1925). The dimensions and other features of the cell are consistent with previous diagnoses of the species.
new
taxa
for
the
desmidia
crux-melitensis
flora
from
Ehrenberg
wetland
var
.
ecosystems
multispinosa
of
W
.
Western
W
.
A
.
Kow
Pomerania
.
var
.
nov
.
,
Poland
and
Habitat: water-reservoir interdune depression dominated by Sphagnum mosses with some mosses pH rank – 6.3–6.4.
fasciculatum
Distribution in Poland: not recorded.
Occurrence: Benthic, oligotrophic and mesotrophic lakes, in soft water habitats and Sphagnum bogs, intermingled with other desmids.
Ehrenberg
ex
Ralfs
General distribution: this form of cells has not been previously reported in the algological literature.
var
.
Type: Fig. 1A View Fig .
burchardtii
Remarks: Analysis and review of documented descriptions of the species Micrasterias crux‑melitensis and its varieties and forms in taxonomic studies ( Krieger, 1939; Forster, 1982; Růžiča, 1981; West, West, 1912; Coesel, 1985; Palmar-Mordvintseva, 1982, 2005; Prescott, et al., 1975; Roll, 1924, 1925; Coesel, Meesters, 2007) showed the walls of the cells which have not yet been recorded in the recognised algological literature, on the entire surface and in the marginal parts of the gable patch and the patches of further rows are equipped with spikes. Typically, the morphological features and ornamentation of cell walls are arranged in a very regular manner. Deviations in the arrangement and symmetrical arrangement of its elements on the cell wall suggest that the observed cell specimen of Micrasterias crux‑melitensis is probably a morphological form of the species resulting from the influence of environmental factors. The habitat in which this particular form of the taxon was recorded is distinguished by a very natural phytocoenosis and the lack of impacts resulting from anthropogenic processes.
| 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.