Etym.: the name of the variety refers to the fibrillose pad usually presentat the base and around the stem.
This form is characterized by having a rather long stem, 50-80 mm, whose underground portion is normally covered by numerous mycelial threads, some tending to become rhizomorphic, that usually persist for a long time. The spore-sac is usually more flattened, the mouth less prominent in herbarium specimens and the stem more frequently taperinc towards the base. I have found no other feature by which it may be separated from the var. campestre and may well be just a growth condition. It has been verg well described by A. H. Smith (1951), and seems to be more frequent in the region of the Great Lakes in the United States. The spores under SEM are seen to have a more anastomosed ornamentatior whichin some instances may become subreticulate.
Habitat: sandy soil in lake dunes.
Distribution: North America: Great Lakes region of United States and Canada. Europe: S France.
Holotype: Canada, E shore of Lake Huron, leg. Dearness, IX.1891 (NY!).
Illustration: A. H. Smith (1951: pl. XXXVIII, fig. 2).