Rivularia (corrected Gloeotrichia genus)

[specious_reasons]

I haven't visited in a while, but I'm fairly excited about the current sample I took from a lake up in Northern Minnesota. I'm pretty certain this is the cyanobacteria Rivularia in the Gloeotrichia genus. In this case, it showed itself as small, dark green puffs in the water.


Rivularia in darkfield by Specious Reasons, on Flickr


cyanobacteria, probably Rivularia by Specious Reasons, on Flickr

[Simon W]

See why you were excited, beautiful. Is that a darkfield patch or a 'proper' brightfield condenser?

[specious_reasons]

See why you were excited, beautiful. Is that a darkfield patch or a 'proper' brightfield condenser?

Thanks!

My microscope is a combination of a indo-chinese microscope and parts scavenged from a Nikon Optiphot. I'm using the condenser from the Optiphot and has one of those dials where I can switch between condenser modes.
The first is using the darkfield setting and the second is brightfield, only the bulk of the colony is underneath it. That's one reason why it's so dark near the center. I probably also had the iris on the condenser closed more than is optimal for my 40x objective.

[myriophyllum]

Hi,

very nice!

Greetings

Jens

[René]

Hi,
It's certainly Rivulariaceae, but the genus Rivularia is benthic. This is Gloeotrichia, very similar to the G. echinulata we see overhere.
Best wishes, René

[specious_reasons]

Hi,
It's certainly Rivulariaceae, but the genus Rivularia is benthic. This is Gloeotrichia, very similar to the G. echinulata we see overhere.
Best wishes, René

Thanks, I'll update it accordingly. That's the problem with identification by Google. Actually, Guide to Microlife led me astray, and Google only helped.