Belongs within: Florideophycidae.
The Batrachospermales are a group of freshwater red algae characterised by uniaxial gametophytes, together with pit plugs with a domed outer cap layer but no cap membrane (Müller et al. 2002).
Batrachospermales
| i. s.: Tuomeya americana MS02
| Paralemanea catenata MS02
| Nothocladus nodosus MS02
| ‘Audouinella’ macrospora MS02
|–Lemanea [Lemaneaceae] HS02
| `–L. fluriatilis [=Sacheria fluriatilis] G03
`–Batrachospermaceae HB03
|–Psilosiphon scoparium HB03
|–Sirodotia HS02
| |–S. huillensis MS02
| `–S. suecica MS02
`–Batrachospermum MS02
|–B. atrum MS02
|–B. boryanum MS02
|–B. gelatinosum MS02
|–B. helminthosum MS02
|–B. louisianae MS02
|–B. macrosporum MS02
|–B. turfosum MS02
`–B. virgatodecaisneanum MS02
*Type species of generic name indicated
REFERENCES
[G03] Gnilovskaya, M. B. 2003. The oldest tissue differentiation in Precambrian (Vendian) algae. Paleontologicheskii Zhurnal 2003 (2): 92–98 (transl. Paleontological Journal 37 (2): 196–204).
[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.
[HB03] Harvey, A. S., S. T. Broadwater, W. J. Woelkerling & P. J. Mitrovski. 2003. Choreonema (Coralllinales, Rhodophyta): 18S rDNA phylogeny and resurrection of the Hapalidiaceae for the subfamilies Choreonematoideae, Austrolithoideae, and Melobesioideae. Journal of Phycology 39: 988–998.
[MS02] Müller, K. M., A. R. Sherwood, C. M. Pueschel, R. R. Gutell & R. G. Sheath. 2002. A proposal for a new red algal order, the Thoreales. Journal of Phycology 38: 807–820.