Acrochaetium secundatum, from here.

Belongs within: Nemaliophycidae.

The Acrochaetiales are a group of simple, filamentous red algae.

Characters (from Harper & Saunders 2002): Algae composed of monosiphonous simple or branched filaments, fitting one of the three following sets of characteristics: (1) marine; multiple parietal discoid to band-shaped plastids per cell, lacking pyrenoids; monosporangia unknown, reproducing primarily by asexual tetrasporangia; sexual life history, where known, biphasic with reduced gametophytes; (2) freshwater; cells possessing multiple parietal lobed to discoid plastids, lacking pyrenoids; reproducing primarily by monosporangia; sexual life history, where known, triphasic with morphologically similar gametophytes and tetrasporophytes; (3) marine; cells possessing a single axile stellate chloroplast, each with a single central pyrenoid; reproducing primarily by monosporangia; sexual life history, where known, triphasic.

Acrochaetiales [Acrochaetiaceae]
|--Conchocelis rosea Batters 1892S57
| |--*R. purpureum (Lightfoot) Rosenvinge 1900 (see below for synonymy)HS02
| |--R. penicilliforme (Kjellman) Rosenvinge 1894S57
| |--R. purpureum (Lightfoot) Rosenvinge 1900S57
| `--R. tenue Kylin 1925S57
|--Kylinia Rosenvinge 1909S57, HS02
| |--*K. rosulataHS02
| |--K. arcuata (Drew) Kylin 1944 [=Chromastrum arcuatum, Rhodochorton arcuatum]S57
| |--K. hirsuta (Drew) Kylin 1944 [=Chromastrum hirsutum, Rhodochorton hirsutum]S57
| `--K. moniliformis (Rosenvinge) Kylin 1944 (see below for synonymy)S57
|--Audouinella Bory de Saint-Vincent 1823HS02
| |--*A. hermannii (Roth) Duby in de Candolle 1830 (see below for synonymy)HS02
| |--A. asparagopsisHS02
| |--A. membranacea (Magnus) Papenfuss 1945 [=Rhodochorton membranaceum]S57
| |--A. microscopicaHK90
| |--A. secundataHS02
| |--A. strictaHS02
| `--A. tenueHS02
`--Acrochaetium Nägeli in Nägeli & Cramer 1858 [incl. Liagorophila Yamada 1944]HS02
|--*A. secundatum (Lyngbye) Nägeli in Nägeli & Cramer 1858 (see below for synonymy)HS02
|--A. arcuatum [=Audouinella arcuata]HS02
|--A. daviesiiHS02
|--A. desmarestiae Kylin 1925 [=Rhodochorton desmarestiae]S57
|--A. erythrophyllum Jao 1937S57
|--A. macounii (Collins) Hamel 1928 [=Chantrasia macounii, Rhodochorton macounii]S57
|--A. pacificum Kylin 1925 [=Rhodochorton pacificum]S57
|--A. subimmersum (Setchell & Gardner) Papenfuss 1945 [=Rhodochorton subimmersum]S57
|--A. vagum (Drew) Jao 1937 [=Rhodochorton vagum]S57
|--A. variabile (Drew) Smith 1944 [=Rhodochorton variabile]S57
`--A. yamadae (Garbary) Harper & Saunders 2002 (see below for synonymy)HS02

Acrochaetium secundatum (Lyngbye) Nägeli in Nägeli & Cramer 1858 [=Callithamnion daviesii var. secundatum Lyngbye 1819, Colaconema secundata (Lyngbye) Woelkerling 1973]HS02

Acrochaetium yamadae (Garbary) Harper & Saunders 2002 [=*Liagorophila endophytica Yamada 1944, Audouinella yamadae Garbary 1980]HS02

*Audouinella hermannii (Roth) Duby in de Candolle 1830 [=Conferva hermannii Roth 1806, Chantransia hermannii (Roth) Desvaux 1809]HS02

Kylinia moniliformis (Rosenvinge) Kylin 1944 [=Chantrasia moniliformis, Chromastrum moniliforme, Rhodochorton moniliforme]S57

Rhodochorton purpureum (Lightfoot) Rosenvinge 1900 [=Byssus purpurea Lightfoot 1777, Audouinella purpurea (Lightfoot) Woelkerling 1973]HS02

*Type species of generic name indicated


[HS02] Harper, J. T., & G. W. Saunders. 2002. A re-classification of the Acrochaetiales based on molecular and morphological data, and establishment of the Colaconematales ord. nov. (Florideophyceae, Rhodophyta). European Journal of Phycology 37: 463–476.

[HK90] Huisman, J. M., G. A. Kendrick, D. I. Walker & A. Couté. 1990. The marine algae of Shark Bay, Western Australia. In: Berry, P. F., S. D. Bradshaw & B. R. Wilson (eds) Research in Shark Bay: Report of the France-Australe Bicentenary Expedition Committee pp. 89–100. Western Australian Museum.

[S57] Scagel, R. F. 1957. An annotated list of the marine algae of British Columbia and northern Washington (including keys to genera). National Museum of Canada Bulletin 150: 1–289.

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