Notes on Iowa Diatoms I. An Interesting Collection from a Moss-Lichen Habitat

Abstract

A diatom flora associated with a lichen (Collema sp.) and various mosses on a sandstone outcrop in Boone County, Iowa, is analyzed. Species rated "common in collection'', are Melosira roseana Rabh., Pinnularia lata Breb., Navicula gibbula Cleve, Navicula mutica Kutz., N. mutlca, var. Cohnii (Hilse) Grun., Navicula contenta var. biceps Arnott, Achnanthes (Achnanthidium) coarctata Breb., and Hantzschia amphioxys (Ehr.) Grun. Less common species are Hantzschia amphioxys var. major Grun., Caloneis bacillum (Grun.) Meresch, Neidium knuthii, var. heilprinensis Foged, Navicula mutica var. nivalis (Ehr.) Hustedt, and Navicula fritschii Lund. The occurrence of several isolated valves of Hantzschia possessing numerous spines is noted.