The spores (conidia) are dark brown and usually occur in grape-like masses on white woolly colonies. The spores are flattened and have a colourless line at the edge. When germinating they break along the line in the manner of a clam shell. In some species the filaments have dark cross-walls. Common on dead plants, especially grasses and sedges, and often isolated from air near grassy places in the autumn. The drawing at left illustrates several species. The photographs are of Arthrinium cuspidatum found growing on dead grass stems in a salt marsh in St. Andrews, New Brunswick. Holomorphs: Apiospora, Physalospora. Ref: Ellis 1971