| Seated on the mycelium, at the first as little orange points, are the perithecia, which enlarge and become nearly black. |
| In these genera the sporidia, on maturity, may be observed blackening the matrix round the mouths of the perithecia. |
| When the internal contents of these perithecia were inspected, only a few minute asci were observed. |
| The perithecia are generally imbedded in the outer portion of the stroma, the mouths opening through the carbonous crust. |
| The perithecia contain pear-shaped asci, which spring from the base and enclose a definite number of sporidia. |
| Perithecia are always smaller than wild-type perithecia and a quarter of them contain only sterile paraphyses. |
