Search found 62 matches

by Bernd
Fri Jul 31, 2020 11:28 am
Forum: Photography Through the Microscope
Topic: Unknown desmid
Replies: 1
Views: 1019

Re: Unknown desmid

Hi Mike,

I do not think that this is a desmid, but a xanthophyte of the genus Pseudostaurastrum.

Bernd
by Bernd
Thu Jul 19, 2018 12:16 pm
Forum: Photography Through the Microscope
Topic: Diatoms with fibers
Replies: 7
Views: 1256

Diatoms with fibers

Here are a few pictures showing freshwater centric diatoms from a local pond, either Cyclotella or Stephanodiscus , with very pronounced fibers made of chitin. I showed similar pictures several years ago http://www.photomacrography.net/forum/viewtopic.php?t=12906&sid=6b9f13372fec053448dddc9bdc101d8f...
by Bernd
Sun Feb 19, 2017 1:40 am
Forum: Photography Through the Microscope
Topic: Staurastrum desmid 100x and SEM
Replies: 5
Views: 773

For me this looks like a half-cell of a Staurastrum desmid, not a diatom.

Bernd
by Bernd
Wed Jul 20, 2016 10:13 am
Forum: Photography Through the Microscope
Topic: Mucous rods of the desmid algae Arthrodesmus octocornis
Replies: 4
Views: 992

Mucous rods of the desmid algae Arthrodesmus octocornis

A few days ago I found the desmid algae Arthrodesmus octocornis (= Xanthidium octocorne) in a local pond. http://www.photomacrography.net/forum/userpix/101_Arthrodesmus_01_1.jpg With steep DIC I could see that the cell was embedded in a broad mucilaginous envelope (border outlined by white arrows). ...
by Bernd
Sat Apr 30, 2016 11:59 pm
Forum: Photography Through the Microscope
Topic: trouble with ID
Replies: 5
Views: 920

The flagellates are attacked by fungal parasites, so-called chytrides.
by Bernd
Sun Apr 17, 2016 8:13 am
Forum: Photography Through the Microscope
Topic: Meridion circulare diatoms in phase contrast
Replies: 8
Views: 1074

Meridion circulare diatoms in phase contrast

As Meridion circulare is still very abundant, I took a few images with phase contrast. Not many details, but quite nice overall. http://www.photomacrography.net/forum/userpix/101_Meridion_4_1.jpg http://www.photomacrography.net/forum/userpix/101_Meridion_3_1.jpg http://www.photomacrography.net/forum...
by Bernd
Fri Mar 25, 2016 7:05 am
Forum: Photography Through the Microscope
Topic: The diatoms Rhopalodia and Epithemia - evolution in action
Replies: 3
Views: 1756

The diatoms Rhopalodia and Epithemia - evolution in action

Diatoms of the genus Rhopalodia and Epithemia, both belonging to the family Rhopalodiaceae, are unique in possessing so-called spheroid bodies in addition to plastids and mitochondria in their cytoplasm. The spheroid bodies are proposed to carry out nitrogen fixation for the diatom cell and replicat...
by Bernd
Wed Mar 16, 2016 12:05 pm
Forum: Photography Through the Microscope
Topic: Meridion circulare diatoms
Replies: 5
Views: 831

Meridion circulare diatoms

As almost every March I have again revisited my favourite location for the diatom Meridion circulare . The brown, foamy biomass is almost a pure culture of M. circulare if you exclude the ciliates which feast on M. circulare . http://www.photomacrography.net/forum/userpix/101_8_1.jpg Since I like th...
by Bernd
Tue Mar 01, 2016 12:36 pm
Forum: Photography Through the Microscope
Topic: Cytoplasmic streaming in a large Desmid
Replies: 9
Views: 922

My guess is that the little flagellates actually are zoospores of a parasitic chytrid fungus. The way they move is quite characteristic.

Bernd
by Bernd
Mon Jun 29, 2015 11:54 am
Forum: Photography Through the Microscope
Topic: Bosmina
Replies: 20
Views: 2150

Dear Jacek, nice photos! Have you noticed that the specimen on the last image of your post from June, 24th is full of parasites? The many oval objects inside the body of the water flea are most likely Coelosporidium chydoricola , a member of the Haplosporidia. See Green, J. (1974). “Parasites and ep...
by Bernd
Wed Feb 11, 2015 11:59 am
Forum: Photography Through the Microscope
Topic: Synedra diatoms in mucilage
Replies: 3
Views: 576

Dear Michael, nice series of fotos! However, they do not show reproducing diatoms in a mucilage sheath. Just the opposite. These diatoms have been eaten (ingested) by an amoeba, most likely Leptophrys vorax. These amoebae can ingest an incredible amount of food. Their cytoplasm then is just a small ...
by Bernd
Mon Jun 09, 2014 8:42 am
Forum: Photography Through the Microscope
Topic: Cothurnia imberbis
Replies: 12
Views: 1337

Dear Jacek, your pictures shows Thuricola folliculata. This ciliate is easy to identify, because he lives in a lorica which can be closed with a flap (very clearly visible in the DIC images in the upper third of the lorica, pressing against the ciliate´s body) when the ciliate contracts. It is not t...
by Bernd
Wed May 28, 2014 12:01 pm
Forum: Photography Through the Microscope
Topic: Dinoflagellata
Replies: 13
Views: 1196

The fluorescence image is really beautyful. What exactly does the foto show? An empty theca with the focus on the inside of the ventral plates?

Bernd
by Bernd
Wed Oct 02, 2013 10:56 am
Forum: Photography Through the Microscope
Topic: Closterium parasitized.......video
Replies: 2
Views: 627

Dear Francisco,

nice video. The parasite most likely is Myzocytium. Ancylistes closterii looks quite different.

Bernd
by Bernd
Wed Jul 24, 2013 1:33 pm
Forum: Photography Through the Microscope
Topic: Bosmina longirostris
Replies: 7
Views: 2744

Dear Jacek, have you noted that the last photo shows a Bosmina specimen parasitized by Coelosporidium chydoricola , which belongs to the little studied Haplosporidia? The parasites are the ovoid structures between the gut and the brood chamber. The parasite has been described by Green, J. (1974). “P...