Perithecium:
* Structure: Closed, flask-shaped structure with a small opening called an ostiole at the top.
* Spore Release: Spores are released through the ostiole, often aided by the pressure of developing ascospores.
* Appearance: Often dark and somewhat spherical, sometimes embedded in the substrate.
* Examples: Many fungi in the class Sordariomycetes, such as *Neurospora crassa* and some plant pathogens.
Apothecium:
* Structure: Open, cup-shaped or saucer-shaped structure with a broad, exposed hymenium (spore-bearing surface).
* Spore Release: Spores are released directly from the exposed hymenium.
* Appearance: Usually brightly colored and more open than perithecia, often resembling small cups or saucers.
* Examples: Many fungi in the class Pezizomycetes, including morels, cup fungi, and some lichens.
Here's a table summarizing the key differences:
| Feature | Perithecium | Apothecium |
|---------------|-------------|------------|
| Shape | Closed, flask-shaped | Open, cup-shaped |
| Spore Release | Through ostiole | Directly from hymenium |
| Appearance | Dark, often embedded | Brightly colored, open |
| Examples | *Neurospora crassa*, plant pathogens | Morels, cup fungi, lichens |
In essence, perithecia are "closed" and release spores through a small opening, while apothecia are "open" and release spores from their exposed surface.
