This is a continuation of a Thyridiaceae fungus found on dead stems of Thymus capitatus in the island of Gozo, which it (or a similar fungus) was also relieved by my colleage from Malta.

After reading a relevant paper by Julia Checa , Natividad Blanco and Babriel Moreno (Mycotaxon 125:149-164, 2013) I have opted that this should be Mattiriola,but not everything match. Mattiriola is characterised as follows (brackets indicates if the character is observed in this specimen studied)

Stroma present, erumpent (YES)
Loosely interwoven yellowish or brownish tomentum (I think I saw a pale-coloured tomentum, so possibly YES)
KOH negative (True)
Perithecia globose without converging ostioles (*1)
Ascospores muriform (YES, but also Thyridium has muriform ascospores)
Hyaline to greenish yellow ascospores when mature (Probably, they are brownish green )

*1 I have interpreted the fungus as a single fusiform perithecium enclosed within a black stroma (with hyaline tomentose hyphae) like a sausage within a sausage roll.

If this is a Mattiriola, then the keys would point to M. ohiensis or M. platensis, but seeing that the latter is from Ailanthus trees in Argentina, it is unlikely the same species. Still I'm not particularly happy to ascibe it to that species mostly because of the different stroma and I think it can even be a case of a new species of Mattiriola.

The fact that this fungus has quite dark spores (but in my opinions with green tones), there might be doubt over the other genus of this family (Thyridium) but when I checked the spore images of Mattriola in the paper mentioned above, despite the authors are stating that Mattiriola spores are hyaline, I see dark-septate, fuscous dictyospores in their detailed images, as in my specimen so then Mattiriola sp. is my final judgement between the two - - - - unless it is not a Thyridiaceae!