Anabaena wallumensis G. B. McGregor, 2018

Mcgregor, Glenn B., 2018, Freshwater Cyanobacteria of North-Eastern Australia: 3. Nostocales, Phytotaxa 359 (1), pp. 448-450 : 448-450

publication ID

https://doi.org/ 10.11646/phytotaxa.359.1.1

persistent identifier

https://treatment.plazi.org/id/6B6487B2-1804-2619-EB9A-5663D538A847

treatment provided by

Felipe

scientific name

Anabaena wallumensis G. B. McGregor
status

sp. nov.

Anabaena wallumensis G. B. McGregor sp. nov. Fig. 39 A–D.

Filaments entangled in loose mucilaginous clusters, dispersed among other cyanobacteria and microalgae in periphytic mats. Trichomes flexuous, ± irregularly coiled, deeply constricted at cross walls, not attenuated towards ends, 3.1– 5.0 μm wide, with a sub-symmetric structure, one heterocyte occurring every (10–) 24–40 (–52) vegetative cells. Vegetative cells barrel-shaped, isodiametric or up to 1.7 × longer than wide, (3.1–) 4.0–5.0 μm long × 5.6–7.5 (–8.5) μm wide, with granulated blue-green contents; apical cells rounded and undifferentiated. Heterocytes intercalary, sub-spherical to cylindrical, 1.5 × longer than wide, 4.5–7.0 μm long × 6.0–8.5 (–10) μm wide, occasionally in pairs. Akinetes rounded cylindrical, solitary and always adjacent to heterocytes, 2.2–2.7 × longer than wide, 7.5–11 μm long × 18–22 (–27) μm wide, endospore pale golden brown, exospore covered with flexuous hair-like processes, up to 6.3 μm in length.

Holotype:— Preserved specimen deposited in the Queensland Herbarium ( BRI), accession number AQ826841. Type locality: Moon Point Fens, Fraser Is. (25 o 12’48.84” S, 153 o 3’36.43” E). Etymology: the specific epithet refers to the indigenous Kabi word for the wallum banksia (Banksia aemula R. Brown) which is used to describe coastal shrub and heathlands on deep, nutrient-poor, acidic sandy soils. GoogleMaps

Specimens examined:—Boomerang Lakes, Lake Jennings, Moon Point Fens at Great Sandy Natl Park, Fraser Is. Section, Rainbow Beach Fens at Great Sandy Natl Park, Cooloola Section.

Observations:— A. wallumensis is morphological similar to a number of benthic species known from tropical and subtropical marshy habitats, which have large cylindrical akinetes adjacent to intercalary heterocytes ( A. fuscovaginata , A. iyengarii , A. oblonga , A. orientalis ). However, in A. wallumensis , the mature exospore is densely covered in distinctive, flexuous hair-like processes. The material was observed growing in the metaphyton of several shallow peaty wetlands amongst emergent sedges, and in the littoral areas of acidic perched lakes in SE Queensland.

BRI

Queensland Herbarium

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