Ecology - Widespread, ubiquitous soil organism found most frequently in tropical and sub-tropical climates.
- 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.
- 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.
-Teleiomorph = Emericella nidulans (Cleistiothecium = sexual state)
- Mycotoxin produced = Sterigmatocystin
(Tape Preparation, LPCB X250)
Smooth Round Hülle Cells (10 - 25 μm dia.)
Emericella nidulans - Split Cleistothecium Releasing Ascospores
(Tape preparation in KOH - natural purple colour due to reaction of Cleistothecium contents with KOH -X400)*
Ascospore Contents of Cleistothecium With Hülle cells Present
(natural brownish colour of Ascospores and purple colour of those reacting with KOH)
(Intended as 1024 X 768 Wallpaper - May be re-sized by Blogger)
Aspergillus nidulans/Emericella nidulans
(Cleistothecium surrounded by Hülle cells, expelling ascospores)