BRYOPHYTES OF ST. MARTIN ISLAND, DELTA COUNTY, MICHIGAN

摘要

The first bryological survey of St. Martin Island, Delta County, Michigan was conducted in 2013 and 2014; it is only the second bryological survey of any island in the Grand Traverse Islands archipelago in northwestern Lake Michigan. The island has anarea of 523 ha, is located 15 km south of the tip of the Garden Peninsula, and is underlain by Niagara dolomite, which outcrops as cliffs, particularly on the west coast. The predominant vegetation type is hardwood and mixed conifer-hardwood forests, and there is a small ephemeral pond and hardwood swamp in the northern part of the island. A total of 105 species of bryophytes (81 mosses and 24 liverworts) were recorded from St. Martin Island. Its bryophyte diversity is comparable to that of nearby Summer Island. Thirty species of mosses and ten species of liverworts represent new records for Delta County.