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15-09-2025 14:40

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello.I'm searching for a digital copy of the seco

14-09-2025 22:16

Philippe PELLICIER

Apothécies petites jusquà 3 mm, oranges, avec de

13-09-2025 14:01

Thomas Flammer

dark brown apothecia, splitIKI-Spores biguttulate

10-09-2025 17:18

Blasco Rafael Blasco Rafael

Hola, encontre este estiercol de vaca estos apotec

13-09-2025 14:10

Wim de Groot

We found this hymenoscyphus on rubus fruticulosis.

13-09-2025 15:43

Edmond POINTE Edmond POINTE

Bonjour Christian,J'ai trouvé deux spores ressemb

11-09-2025 16:57

Jason Karakehian Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

10-09-2025 23:53

Marcel Heyligen Marcel Heyligen

Found on Robinia pseudoacasia together with Diapor

02-09-2025 11:34

Thomas Læssøe

https://svampe.databasen.org/observations/10527903

07-09-2025 08:19

Josep Torres Josep Torres

Hello.Tiny pinkish discomycetes, photographed and

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Pestalotiopsis microspora? growing indoors on an A/C cardboard filter in Miami, Florida, USA.
Wilhelm Guggisberg, 01-04-2023 04:22
Wilhelm GuggisbergThis is the first time I encounter a species of the Genus Pestalotiopsis (Ascomycota, most likely P. microspora) growing indoors in a residential setting. This swab sample was taken from a cardboard air handler filter. The species is very particular due to the fact that is capable of breaking down and digesting polyurethane! Quite a finding!
Swab sample specimen on the optical microscope at 400x stained with Lactophenol Cotton Blue.
Location: Indoor urban area in Miami Shores, Miami, Florida, USA.
  • message #75736
  • message #75736
  • message #75736
Bernard Declercq, 01-04-2023 08:28
Bernard Declercq
Re : Pestalotiopsis microspora? growing indoors on an A/C cardboard filter in Miami, Florida, USA.
Hello Wilhelm,

Can you supply us a description and a photo of the conidia 1000x so that we can see a.o. the appendages in detail?.  The length of the apical appendages is important to differentiate the species from other species. Staining is not useful here.

Regards,

Bernard
Wilhelm Guggisberg, 02-04-2023 05:20
Wilhelm Guggisberg
Re : Pestalotiopsis microspora? growing indoors on an A/C cardboard filter in Miami, Florida, USA.
Immersion oil at 1000x. Characteristics: three-euseptate and pigmented median cells with two to four apical appendages arising as tubular extensions from the apical cell and a centric basal appendage. In the new pic: the reticule bar space is 10u, the approx. spore lenght is 6-7u., the terminal appendages are visible a bit. Hope that helps. -Regards.
Bernard Declercq, 02-04-2023 20:24
Bernard Declercq
Re : Pestalotiopsis microspora? growing indoors on an A/C cardboard filter in Miami, Florida, USA.
Hello Wilhelm, 

I guess the genus name is OK. As I said, the length of the appendages is needed for further identification.

The conidium length is (including both hyaline end cells!) certainly longer than what you mention. We do not have Pestalotiopsis species with such small conidium size here in Western Europe. I am afraid there is something wrong with your scale bar.

According Saccardo's Syll. fung. III, Pestalotiopsis microspora, syn.Pestalotia microspora Speg., has conidia 18-20x5-6 µm and should, as far as your info is correct, be excluded. 

Regards,
Bernard
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