Athalamia
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Authority
Bischler, Hélène, et al. 2005. Marchantiidae. Fl. Neotrop. Monogr. 97: 1--262. (Published by NYBG Press)
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Family
Cleveaceae
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Scientific Name
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Type
Type. Athalamia pinguis W. Falc. Name from a = lacking, thalamus = receptacle, referring to the lack of terminal receptacles.
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Synonyms
Clevea
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Description
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Genus Description - Thallus 1.5-6 mm wide, bright green, often tinged with purple. Branching dichotomous and ventral. Epidermal pores with single ring of 4-7 cells, radial walls thin or thickened. Air chambers in 1-4 layers. Basal tissue without mucilage cavities. Ventral scales without oil cells and usually without marginal papillae, with l(-3) filiform appendages, not constricted basally. Monoecious or dioecious. Antheridial groups often behind archegoniophore; scales associated with androecia lacking. Archegonia single per archegonial cavity, in dorsal cushions bounded by scales. Archegoniophore stalk dorsal (not terminal), without assimilatory strip or rhizoid furrows, with scales; receptacle 2- to 8-lobed, with simple or without epidermal pores on dorsal side. Involucres 2-8, outwardly projecting, opening obliquely. Sporophytes 1 per involucre, with hardly elongating seta. Capsules splitting into 4-7 irregular valves to 1/2-3/4 of capsule length. Spores 2000-3000 per capsule, 40-70 µm diam., distal and proximal faces with rounded protuberances, ornamented at top, trilete scar distinct. Elaters with 2-3 helical bands. Gametophytic chromosome number n = 9 or 18.
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Discussion
A genus of 12-15 species of rocky habitats, distributed worldwide in cold and temperate areas. Two species are recorded from the Neotropics, one from the Andes (600-2800 m), the other from S United States and Mexico.