Hi Marek

you are right, and it was me to suggest that henningsiana is an older name for paludosa. But this is mainly based on the substrate Cyperaceae, while the crucial character, the absence of croziers, was probably never tested in the type materials. With a narrow generic concept one may use Clarireedia for this species, with C. bennettii representing a later synonym of R. calopus. The authors who introduced the new genus overlooked this synonymy.
Zotto

Indeed, and although this is only ITS1, the result shows that it falls to R. paludosa, but two other sequences under that name (KC533543 and Z81442) are intermediate to calopus, while concurring with R. calopus KF588373.

In attach you see a comprehensive tree of the group (henningsiana highlighted in yellow).

Thank you for your response,

I can therefore understand that Rutstroemia paludosa / henningsiana and R. calopus are one and the same species which has been combined into one by studying DNA. Authors based on type items? And now a new genus has been established by Saldago et alia where Clarireedia bennetii represents these three species?

Saldago et al. overlooked that paludosa and calopus are in GenBank. And yes, they considered samples as one species which are probably two: R. calopus and R. paludosa differ by croziers (H+/H-), and this was so far correlated with the two clades and the two substate families.

I can see that taxonomy is still unclear, will most likely change and the article of Salvago et alia doesn? change anything. In my opinion (as you have helped me to clarify it) there is a clear morphological and ecological (and molecular?-two clade) difference between Rutstroemia paludosa-synonym R. henningsiana (crozier – / familia Cyperaceae) and R. calopus (croziers + / familia Poaceae). So far I have found R. paludosa (I will use this name in my own publication), which appears to be a characteristic and relatively abundant species of the tall-sedge beds in well-preserved localities in the central Czech Republic. Unfortunately, I haven't found R. calopus yet ...

Many thanks for the info and explanation of the current situation

Best regards

If you got your samples on Cyperaceae/Juncaceae it is very likely R. paludosa. But check the croziers to be more sure. Other clear differences I did not find. There is also a maritima, perhaps more in the mediterranean.  And you see from the tree that more clades exist, including those species described by Saldago et al.

I remember that several species are parasites of grasses, e.g. on golf places, so of economic importance. But that paper, so helpful it is from a molecular point of view, did not give the final nomenclature, if such will ever be achieved, and no information on croziers.