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| Calasterella californica (Hampe ex Austin) D.G.Long & T.X.Zheng, in Long et Zheng, 2023. |
Abstract
Based on a phylogenetically and morphologically distinct species, a new genus Calasterella is established. A new subfamily, Calasterelloideae, is also proposed to contain this genus.
Keywords: Marchantiales, taxonomy, systematics, bryophytes
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| Calasterella californica (Hampe ex Austin) D.G.Long & T.X.Zheng (≡ Asterella californica (Hampe ex Austin) Underw.). |
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| Calasterella californica (Hampe ex Austin) D.G.Long & T.X.Zheng. A: Immature carpocephalum from below showing deeply cleft involucres with overlapping margins of cleft. B: Mature carpocephalum from below showing pseudoperianths and dehisced sporophyte with lemon-yellow spores. C: Scanning Electron Micrographs of the spores, distal face. D: Scanning Electron Micrographs of the spores, proximal face. Arrow heads: involucre. Arrow: spores. Scale bars: A, 2 mm; B, 1 mm; C, D: 20 μm. [A: D.G. Long 45940 (E). B: D.G. Long 45333 (E). C, D: D. G. Long et al. 44666 (E)] |
Calasterelloideae T.X.Zheng & D.G.Long subfam. nov.
includes one genus, Calasterella D.G.Long & T.X.Zheng, gen. nov.
Diagnosis: Differs from Aytonioideae and Reboulioideae by the following combination: dioicous sexuality; strictly dichotomous branching pattern; ventral tissue with mucilage cavities; up to four appendages of ventral scale; deeplylobed female receptacle with pseudoperianths and involucre cleft to base; lemon-yellow spores with conspicuous trilete ridges, prominent equatorial wing, similar ornamentation on proximal and distal surfaces, lacking large areolae but with fine network of alveolae.
Type: Calasterella D.G.Long & T.X.Zheng, gen. nov.
Type species: Calasterella californica (Hampe ex Austin) D.G.Long & T.X.Zheng comb. nov.
(≡ Fimbraria californica Hampe ex Austin, Hepat. bor.-amer. 33, 1873).
≡ Asterella californica (Hampe ex Austin)
Etymology: The genus is named by the combination of the abbreviation of its main distribution region “California”,and the previous placement “Asterella”.
Calasterella californica (Hampe ex Austin) D.G.Long & T.X.Zheng, comb. nov.
David G. Long and Tian-Xiong Zheng. 2023. A New Subfamily Calasterelloideae and New Genus Calasterella for a phylogenetically and morphologically distinct member of the Aytoniaceae. Phytotaxa. 606(3); 225-230. DOI: 10.11646/phytotaxa.606.3.6