Human spleen stained with GMS for fungus

Help With Fungus Type

We have this tissue (human Spleen).  It was bought for fungus and we did the GMS stain for it but not sure of it’s type.  To me (untrained eye), it looks like blastomycosis.  It stained positive with GMS, has budding and otherwise looks like round circles.  I’m sorry, I don’t have H&E pictures yet, they are coming later.

Since I am not a pathologist, just interested in all tissues, with all stains, I’m asking you to help me identify this fungus type.

What do you think this fungus type is?

Thank  you

Sm Intestine / Alcian Blue / Fungus

After staining a series of small intestine slides  with Alcian blue pH2.5 for controls I noticed little black dots in the tissue.  Upon closer look, I believe those black things are fungi.  The alcian blue stain still looks good and slides can be used for that stain but I’ve never seen fungi like this before.

What Kind of Fungus is This?

You know there’s something wrong with the GMS stain when everything turns black.  Time to make new reagents.  After they are all made, it’s right to test the stain with known control tissue.  After the staining was complete, a variety of black components covered my slides.  The GMS stain is a silver stain that fungi “reduce” and then appear black.  Unfortunately other tissues also can turn black and add confusion to the diagnosis of a type of fungus.  After the slides were dried for 24 hours, I took high-resolution pictures of the black substances in my tissues to hopefully get help in fungi identification from you.  Below are 6 different slides with possible fungi.  If anyone knows what any of these pictures could be please comment below.  All comments are welcome.

  1. Muc 1.1 GMS 20x











2. Fungus 2 GMS 100x














FUN 6 GMS 100x














Fun 1.1 GMS 100x


































FUN GMS 2.1 100x













6. GMS 1.1 100x

Identification of Fungus

Mycology, the study of fungus is not something I know too much about especially when it comes to histopathology.  I do know that fungus is not something I want propagating in my organs or tissues in serious quantity.  Certain species can wreak havoc on the internal and external systems of the animal bodies.  The identification of these fungi in tissues is visualized by staining with GMS, PAS and Gridley’s.  The stain fungi are then analyzed under the microscope by a pathologist who determines by size, shape and surrounding tissue changes, what the type of fungus is.  This is a very exact science that takes years of practice and studying to determine a possible diagnosis.  Some histologists may be able to guess at the type of fungus on a slide but only guess.  For a histologist must rely on the shape and color of a fungus determined by the stain.  I do this on a consistent basis, trying to guess what kind of affliction the tissue reveals after staining.  For fungus identification, I have been relying on a website called doctorfungus.  Here I can analyze my slides against a good knowledge base and slides to match.  Thus I feel like sharing this resource with you might help.