Filamentous Fungus
Ecology - Widespread, ubiquitous soil organism found most frequently in tropical and sub-tropical climates.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmT7CieOjuzxLcBKa1bbXf-nikAM862MAM48xPNv6oSbt1mYjnUgOzr39LZNcUVqjtDtVFsYIdrS789v5Xy5HxgTH5Rd38slIlWM6zKRfIJJ-62MCVKhkBjAr6l77wS2ChEgyY4xVx7Ak/s200/A.nidulans+on+SAB.jpg)
Macroscopic:
- Colonies rapidly growing, green to cream-buff.
- Dark green to orange and yellow in areas with Cleistiothecal production.
- Brown to purplish exudates. Purplish reverse.
- Moderate to rapidly growing.
- Colonies dense, velutinous with floccose surface.
Microscopic:
- Conidial heads radiate to loosely columnar.
- Conidiphore stipes 60-130 X 2.5 -3.0 μm.
- Phialides biseriate, limited to upper surface of the vesicle.
- conidia round, smooth to rugulose, (3-4 μm dia.) in short chains
- Cleistothecia often numerous, reddish-brown in colour.
- Hülle cells (10 - 25 μm dia.) typically present. Thick walled, smooth, often surrounding Cleistothecia.
- lenticular ascospores (within Clesitothecium), typically reddish-purple with two equatorial crests. Ascospores (4-6 X 3-4 μm) mature within 2 weeks.
Misc:
-Teleiomorph = Emericella nidulans (Cleistiothecium = sexual state)
- Mycotoxin produced = Sterigmatocystin
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhC_HNwDqWzzfyH5DGVJMC9WLHWwyRUYzHtrZDVyB6J7iUx1rTHkdrBTUt6KCLf6EaWJvh8GmfZHM4rSP_MoAKgKb2hLpjCtgqWvFFJOuwBDytNhJCcSTrwNGBWUoyAPhamRe_tgTPv1dU/s400/A_nidulans_conidiphore_&_Conidiospores.jpg)
(Tape Preparation, LPCB X250)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFeDXoTOf08ztRnRSvryM4qqgWEGmRAYuAcbuQk_fY569uuiYkRihOKjIXOok4HlpBDD6W9B8OPIjeBM4tQUPtUc9mUfRa-bLDD2i4afxZB4hy4YAEu6l41zR-20kKzMJxOdosWh6mOVg/s400/A_nidulans_Hulle_Cells_1.jpg)
(X400, LPCB)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUVjwCjlIz6EAveIvp4CR1prY8HVlVaIQcEzg0f31Q00T4pkyBCSUb-nyzif1XpDF3C2TSgnBQKiUOFldT1_xJ29wacCa3bT2yyUWCraX3xh6yCoc4LElehDfsIOGMAT9yIqQibL9aNG8/s400/A_nidulans_Cleistothecium.jpg)
(Tape preparation in KOH - natural purple colour due to reaction of Cleistothecium contents with KOH -X400)*
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiAn42gAB4mQJ1wcVhS_OkLlXI18VkhxeLTe8CvpHaoziEdSaHwVU5nYIoMRqd_FneJaB5bPS-gg4gp-apJ5aLAWF09Q1NDVidzg95AuTdZXR_gTcfDi2nQnRZlbtEa181DAxEmu7KNHKU/s400/Cleistothecium+Ascospores+1.jpg)
(natural brownish colour of Ascospores and purple colour of those reacting with KOH)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSlxahpoRRr8bjgxJHwbvLnTr8HkGH3R9c33Jgz4HeoPycBllkCNtesq-Q66D4Q_Nkbx8sS85C1zryuGeIYsooO70gHoa88m5OVrQ9JHDF34uYqibnLQ4wBDoWMLli6AFEttOy2xJ2P14/s400/Aspergillus_nidulans_Wallpaper.jpg)
Aspergillus nidulans/Emericella nidulans
(Cleistothecium surrounded by Hülle cells, expelling ascospores)