Ascostromata orange, erumpent, slightly immersed to superficial, stromatic tissue well-developed, pulvinate with papillate to long orange perithecial necks, perithecia diatrypoid. Asci 8-spored, fusoid. Ascospores hyaline, fusoid to ellipsoid, containing one to three irregularly spaced septa. Conidiomata orange, separate or on top of the ascostromata, also evident occasionally as locules inside ascostroma, superficial, conical to pyriform to fluted, unilocular. Conidiophores hyaline with phialidic, irregular branching, determinate conidiogenous cells that occur apically or laterally on branches beneath a septum. Conidia hyaline, non-septate, oblong to slightly curved, of variable size.

Ascostromata aurantiaca, erumpentia, subimmersa vel superficialia, textura stromatica bene evoluta, pulvinata, collis peritheciorum papillatis vel longis. Asci octospori, fusoidei. Ascosporae hyalinae, fusoideae vel ellipsoideae, uno vel tribus septis irregulariter dispositis divisae. Conidiomata aurantiaca, discreta vel super ascostromata, interdum etiam velut loculi in ascostromate videntur, superficialia, conica vel pyriformia vel striata, unilocularia. Conidiophora hyalina cum cellulis conidiogenis phialidicis apicalibus vel lateralibus in ramis subsepto oriundis. Conidia hyalina, aseptata, oblonga velsubfalcata, magnitudine variabili.
Typus: Amphilogia gyrosa.
Etymology. — Greek, amphi, on both sides, and logos, discussion, thus the Greek personification of disputes; referring to the dispute this genus caused regardingthe identity of Cryphonectria.