A species of _Sclerotium_ on the gills of dead Agarics originates _Agaricus tuberosus_, another _Agaricus cirrhatus_,[J] but this should be kept _in situ_ when cultivated artificially, and induced to develop whilst still attached to the rotten Agarics. _Peziza tuberosa_, in like manner, is developed from _Sclerotia_, usually found buried in the ground in company with the roots of _Anemone nemorosa_. At one time it was supposed that some relationship existed between the roots of the anemone and the _Sclerotia_. From another _Sclerotium_, found in the stems of bulrushes, Mr. Currey has developed a species of _Peziza_, which has been named _P. Curreyana_.[K] This _Peziza_ has been found growing naturally from the _Sclerotia_ imbedded in the tissue of common rushes. De Bary has recorded the development of _Peziza Fuckeliana_ from a _Sclerotium_ of which the conidia take the form of a species of _Polyactis_. _Peziza ciborioides_ is developed from a _Sclerotium_ found amongst dead leaves; and recently we have received from the United States an allied _Peziza_ which originated from the _Sclerotia_ found on the petals of _Magnolia_, and which has been named _Peziza gracilipes_, Cooke, from its very slender, thread-like stem. Other species of _Peziza_ are also known to be developed from similar bases, and these Fuckel has associated together under a proposed new genus with the name of _Sclerotinia_. Two or three species of _Typhula_, in like manner, spring from forms of _Sclerotium_, long known as _Sclerotium complanatum_ and _Sclerotium scutellatum_. Other forms of _Sclerotium_ are known, from one of which, found in a mushroom-bed, Mr. Currey developed _Xylaria vaporaria_, B., by placing it on damp sand covered with a bell glass.[L] Others, again, are only known in the sclerotioid state, such as the _Sclerotium stipitatum_ found in the nests of white ants in South India.[M] From what is already known, however, we feel justified in the conclusion that the so-called species of _Sclerotium_ are a sort of compact mycelium, from which, under favourable conditions, perfect fungi may be developed. Mr. Berkeley succeeded in raising from the minute _Sclerotium_ of onions, which looks like grains of coarse gunpowder, a species of _Mucor_. This was accomplished by placing a thin slice of the _Sclerotium_ in a drop of water under a glass slide, surrounded by a pellicle of air, and luted to prevent evaporation and external influences.[N]