abnormal alveolocapillary membrane morphology abnormal alveolar-capillary membrane morphology abnormal blood-air barrier morphology abnormal alveolocapillary barrier morphology MPheno.ontology MP:0002324 abnormal blood-gas barrier morphology any structural anomaly of the membrane between the capillary blood and alveolar air, comprised of the alveolar epithelium and the capillary epithelium and their adherent basement membranes and epithelial cell cytoplasm abnormal alveolar-capillary barrier morphology abnormal pulmonary interalveolar septum morphology