It would then appear that when Wingate sought to impose the Rostafinskian specific name upon our American form by changing (fixing!) Rostafinski's generic reference, and by re-writing the specific description from the pages of the _Monograph_ in order to claim identity, he was entirely without justification, especially since he knew the species appropriately named by his colleague, Dr. Rex, and had the name as used in the Rex and Morgan correspondence. In brief; Mr. Wingate proceeded to re-describe Rostafinski's rozean specimen and referred a long-known American form (very different) to the European specimen as type. Wingate's description is right; he had the American material before him; but his cited type is worthless, an entirely different thing. Does the reader care to see what the European _type_ of our common form, Wingate _teste_, really looks like, let him consult the _Jour. of Botany_, Vol. XXIX., p. 263, 1891. 2. ENTERIDIUM OLIVACEUM _Ehr._ 1818. _Enteridium olivaceum_ Ehr. Aethalium depressed flat, oval or elongate, .3 cm. in extent, .6 mm. thick when fresh, glossy, smooth, greenish-olivaceous-brown; within a spongy net-work representing sporangial walls which are thin, pale olivaceous, perforate by circular openings, meshes surrounded by wide plates; spores in clusters, six or more together, ovoid, distinctly warted at the wider end, pale olivaceous, 9-11 mu. This, the type of the genus, is a very distinct species of this by its structure readily distinguished form. Fries thought the species might represent a less perfectly-developed reticularia, and therefore wrote _Reticularia olivacea_ noting, however, the clustered spores and the lack of hypothallus. Common, as would appear, in Europe and in S. America; rare with us. Reported from N. Hampshire and we have one specimen from Colorado. 3. ENTERIDIUM MINUTUM _Sturg._ 1917. _Enteridium minutum_ Sturg., _Mycologia_, IX, p. 328. Aethalia rounded or elongate, pulvinate, pale umber in color, seated on a broad membranous base, 1.5-2 mm. in diameter; wall wrinkled and usually marked with small scattered pits, pale-yellow, membranous; walls of component sporangia, membranous, minutely roughened, perforated with round openings, the margins of which show many free threads; or reduced to irregular, anastomosing strands arising from the base of the aethalium, with membranous or net-like expansions at the angles and with many delicate, free, pointed ends. Spores pale-yellow, usually united in twos or threes, and ovoid or flattened on one side; when free, globose, very minutely spinulose, 9.5-10.5. Colorado: _Dr. Sturgis._ =3. Dictydiaethalium= _Rostafinski_ 1873. _Dictydiaethalium_ Rost., _Versuch_, p. 5. 1875. _Clathroptychium_ Rost., _Mon._, p. 224.