Collema tenax

Symbiont suggesting cyanobacteria of the genus Nostoc.

Asci subcylindrical to clavate, 8-spored, generally biseriate, with a strong amyloid reaction in Melzer's reagent in the apical apparatus.

Paraphyses filiform, septate, generally simple, slender, up to 4 µm wide at the apex, hyaline with reddish-brown apices providing their distinctive color.

Ascospores ellipsoidal, hyaline, with 3 transverse septa and some longitudinal septa, constricted at the septa, conferring a submuriform appearance.