In the Journal of the Microscopical Society, Mr. F. Currey has detailed several instances of di-morphism which have fallen within his experience. In one instance he has shown that a small simple spored fungus, termed _Cryptosporium Neesii_, Ca., is only a state or condition of a fungus with compound fruit, belonging to the _Sphœria_ section of ascigerous fungi, called _Valsa suffusa_, Fr. Both plants are exactly alike externally, but the perithecium, or flask-like receptacle containing the fructification, in one instance only holds naked spores, and in the other the spores are contained in little elongated vesicular bags or asci, which are packed within the perithecium. Whilst writing this, one of the most wonderful books in a book-producing age lies beside us; it is the second volume of a work on fungi, by the brothers Tulasne; and this, as well as its predecessor, is devoted to this very subject of a multiplicity of form in the fructification of these plants. Illustrated by the most exquisite of engravings which art has ever produced, it also unfolds many a page in the history of these organisms, for which mycologists were not altogether unprepared. In noticing this work, one of our most eminent authors on mycological subjects quotes as an example _Dothidia ribis_, Fr., one of our most common fungi, which occurs in the form of little black shields on dead twigs of currants and goose-berries. Here we have, he says, naked spores (_conidia_) growing on the external cells of the stroma; we have naked spores of a second kind (_stylospores_) produced in distinct cysts (_pycnides_); we have minute bodies of a third kind (_spermatia_) produced again in distinct cysts, resembling very closely similar bodies in lichens; and we have a third kind of cysts, containing the usual sporidia in sausage-shaped hyaline sacs (_asci_). Even here, however, we have not done with marvels; for if the stylospores are placed in water, they produce in the course of twenty-four hours conidia of a second order, exactly analogous to those which arise on the germination of the spores of the rusts and mildews which affect our cereals and other plants. Further reference is also made to three species of moulds, which M. Tulasne has shown to be only varied forms of the mycelium of a species of _Sphœria_ common to various plants; these moulds having been hitherto regarded as fungi perfect in themselves.