There are just a few species with 7 cells:
S. heptamera with very big spores ~ 70µm length. I have seen many immature spores of this species, being different from your ones.
S. vexans has small spores, which I have seen several times in austria. They often have  oblique septa, which may be transverse in immature stadium.
S. septenaria with completely transverse septa, but with much bigger spores, which may be too big for your finding (>50µm length).
S. americana and S. trogospora have spores > 10µm broadth, I do not think that this fits your collection.

As a result of this, I think your species comes closest to S. vexans, from which I have meassured 35-42x6,2-7,5µm as mature spore size.

Probably you can find some mature fruitbodies...it will make things easier :P

regards,
björn

Thanks Bjorn, do you have an opinion about the "tail" attatched to the ascus?

 

Joop

Probably a deformity? S. vexans is still not online on my page (I have to upload it), but it has long stalked asci.