998 'Wisconsin Academy of Sciences, Arts, and Letters. 
at Lutsen it grew in dense patches on old wet logs in deep woods 
associated with Spenolobus Michauxii. 
Sphenolobns Michauxii is rare in the immediate vicinity of 
the Twin Ports, but is very common at Lutsen, Cook County, 
Minn., where every old moss covered log in a cedar swamp grew 
patches of it. At Solon Springs it covered a large log across a 
brook. The plants here were very slender and delicate, al¬ 
though fruiting, while at Lutsen the normal size of the species 
was attained. 
Sphenolobus exsectus has oval gemmae and the leaf cells are 
uniformly thickened and average 9x18^. 
Sphenolohus exsectaef ormis has angular gemmae and the leaf 
cells are thin walled or with small but distinct trigones and 
average 22x36^. Fortunately the species rarely fail to produce 
gemmae. B'oth affect old wood, preferably a bare rotten stump 
or log in damp woods. 
34. Plagiochila asplenioides (L.) Dumort. 
No. 542 Copper Creek, Wis., Aug. 5, 1909. 
No. 863 Knife, River, Minn., Aug. 1, 1909. 
No. 664 Carlton, Minn., Sept. 26, 1909. 
No. 294 Solon Springs, Wis., 1907. 
No. 973 Oneota, Duluth, Minn., Sept. 19, 1909. 
No. 1188. Lutsen, Cook Co., Minn., Sept. 1911. 
P. asplenioides presents the usual variability of the species 
in the District. It is common along the rocky banks of all the 
streams which cut the Worth Shore and the Copper Ranges. 
Upon the high, dryer, wooded, rocky banks the slender form 
known as P. porelloides occurs. More robust forms occur on 
the rocks in the bed of the stream etc. The underleaves can 
usually be determined but these are slender and fugacious. 
35. Mylia anomala (Hook) S. F. Gray. 
No. 961 Black River, Douglas Co., Wis., Oct. 3, 1910. 
No. 1104 Superior, Douglas Co., Wis., June 4, 1911. 
This species was first found in a sphagnum bog one half mile 
west of the upper falls on Black River. A part of the cran¬ 
berry, tamarack, and balsam swamp has escaped a recent “burn¬ 
ing over.” The dry season of 1910 rendered the swamp nearly 
