Could anybody help me with two Chlorophytes forming short encrusted cushions, one with short filaments and another with irregular polygonal cells? I think the short filaments could be Gongrosira sp.
Pictures: https://goo.gl/photos/GK78oiQt1YYuvTdt9
I agree, they can be Gongrosira sp. (which species?, sorry, but i am not an expert in bentic algae, i work more with the planktonic algae ) but in the link below page 259_266 you can see some images and descriptions ( it is in german but the images are clear)
https://www.lanuv.nrw.de/uploads/tx_commercedownloads/40009.pdf
The prostrate system have round-polygonal cels, and the erect system with short branches
I hope this information can help you
best regards
María Verdugo Althöfer
Thanks you very much,
I'm sure the samples are Gongrosira. I also remember that, in some samples, the terminal cell of some filaments was swollen. This is also a character of this species as I read, and I’ve also saw this character in the book.
I'm not sure about species, but I have enough with the genera for the application of indexes ;). I will try to know the specie for the next sample.
Regards,
It does look like Gongrosira. Please compare with one described in:
Golubic, S. & Fischer, A.G. 1975. Ecology of calcareous nodules forming in Little Connestoga Creek near Lancaster, Pennsylvania. Verh. Int. Verein, Limnol. 19: 2315-2323.
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Thank you Stjepko,
I’ve read the paper and now I have some raisonable doubts about some samples.
But in pictures 4-5-6 I made an IKI stain and the chloroplasts became black, so it must be a Chlorophyte and probably Gongrosira.
When I collected this samples, I note down the colour was chlorophyte-like but, even if the algae is like Gongrosira, when a basal cell layer exists, it may correspond to another species.
Therefore, I can’t be sure about the specie in samples without staining, because the algae could be Pleurocapsa or other species.
Regards,
César Pedrocchi Rius
If you have a microscope with fluorencence:
chlorophyll autofluorescence ist different from Cyanobacterial fluorescence due to the phycobiliproteins.
With this key you can differenciated chlorophytes from cyanobacteria
best regards
Maria
I am also sure of Gongrosira. However for identification of species you have to mesure the breath of the prostrate filaments. They look very slim, So Gongrosira leptotricha may be an option (see Printz 1964). However this species is a little bit "forgotten". Nevertheless we find it often at eutrophicated sites in running waters. . Maria Althöfer already recommendes our determination help. Have a look their on the other Gongrosira species from freshwater.
Cheers Antje
Thanks Antje, I will try to determine Gongrosira species in the new samples I’m collecting this days, in 2017 river assessment campaign ;)
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