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Hildenbrandiales

Hildenbrandia rivularis
Scientific classification
Clade:	Archaeplastida
Division:	Rhodophyta
Class:	Florideophyceae
Subclass:	Hildenbrandiophycidae G.W.Saunders & Hommersand
Order:	Hildenbrandiales Pueschel & Cole, 1982
Family:	Hildenbrandiaceae Rabenhorst, 1868
Genera^[1]
Apophlaea Hildenbrandia Rhodytapium

Hildenbrandiales is an order of crustose forms red alga which bear conceptacles^[2] and produce secondary pit-connections.^[3] They reproduce by vegetative gemmae^[4] as well as tetrasporangia, which are produced inside the conceptacles. The way in which the tetraspores are produced is unusual enough to justify the formation of this distinct order.^[2] Some members of the order are known from freshwater rivers as well.^[5]

Systematics

Hildenbradiales are difficult to discriminate on morphological grounds; tetrasporangia morphology is the only vaguely reliable character, but molecular techniques have indicated a monophyletic Apophlaea within a paraphyletic Hildenbrandia, with many Hildenbrandia species being recognized as non-monophyletic.^[1]

References

^ ^a ^b Sherwood, A. R.; Sheath, R. G. (2003). "Systematics of the Hildenbrandiales (Rhodophyta): Gene Sequence and Morphometric Analyses of Global Collections". Journal of Phycology. 39 (2): 409–422. doi:10.1046/j.1529-8817.2003.01050.x.
^ ^a ^b Pueschel, C. (1982). "Ultrastructural observations of tetrasporangia and conceptacles in Hildenbrandia (Rhodophyta: Hildenbrandiales)". European Journal of Phycology. 17 (3): 333–341. doi:10.1080/00071618200650331.
^ Pueschel, C. (1988). "Secondary pit connections in Hildenbrandia (Rhodophyta, Hildenbrandiales)". European Journal of Phycology. 23: 25–51. doi:10.1080/00071618800650031.
^ Sherwood, A. R.; Sheath, R. G. (2000). "Microscopic analysis and seasonality of gemma production in the freshwater red alga Hildenbrandia angolensis (Hildenbrandiales, Rhodophyta)". Phycological Research. 48 (4): 241. doi:10.1111/j.1440-1835.2000.tb00220.x.
^ Khan, M. (1974). "On a fresh water Hildenbrandia Nardo. From India". Hydrobiologia. 44 (2–3): 237–240. doi:10.1007/BF00187272.

Taxon identifiers
Hildenbrandiales	Wikidata: Q3135619 Wikispecies: Hildenbrandiales AlgaeBase: 4610 BOLD: 78389 CoL: 3CD EoL: 4620 GBIF: 672 iNaturalist: 68616 IRMNG: 12820 ITIS: 954924 NBN: NHMSYS0021059611 NCBI: 31477 NZOR: 64b991e4-3dd6-4767-9692-7b47ba9600c3 Open Tree of Life: 459995 Tropicos: 100364818 WFO: wfo-9000000252 WoRMS: 146316
Hildenbrandiophycidae	Wikidata: Q3006507 Wikispecies: Hildenbrandiophycidae AlgaeBase: 4387 EoL: 38890304 ITIS: 954919 NCBI: 2045264 NZOR: 363e6055-ce43-4bc5-a870-e1b685774804 Open Tree of Life: 5584859 WoRMS: 368689
Hildenbrandiaceae	Wikidata: Q18507321 Wikispecies: Hildenbrandiaceae AlgaeBase: 5208 BioLib: 130594 BOLD: 78390 CoL: B2Q EPPO: 1HILF GBIF: 9028 iNaturalist: 68617 IRMNG: 106428 ITIS: 12294 NBN: NHMSYS0021059612 NCBI: 31478 NZOR: e9212e6d-7ab1-4f2c-9824-3fad319dfe3b Open Tree of Life: 459989 Tropicos: 100370824 WoRMS: 143750

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