Chern-Ricci curvatures, holomorphic sectional curvature and Hermitian metrics

We present some formulae related to the Chern-Ricci curvatures and scalar curvatures of special Hermitian metrics. We prove that a compact locally conformal K"{a}hler manifold with constant nonpositive holomorphic sectional curvature is K"{a}hler. We also give examples of complete non-K"{a}hler metrics with pointwise negative constant but not globally constant holomorphic sectional curvature, and complete non-K"{a}hler metric with zero holomorphic sectional curvature and nonvanishing curvature tensor.