Compendium of All Fungi Known to Date

elaborated. Regarding the Sylloge collection/compendium that I am undertaking, the following must be stated in advance.

I. The species whose diagnoses are published here have not a few been observed by myself; the others have been excerpted from the works of very many mycologists, which are cited. I cannot, however, take any responsibility for these.

II. It may have happened that an identical species is described twice or multiple times under various names; but since certainty regarding the equivalence of the names is still lacking for me, I have been compelled to report all species, leaving a safer judgment to those who have seen the specimens themselves.

III. I have endeavored to collect diagnoses of fungi, as many as I could (and I hope not many are missing), from wherever they might be found. Nevertheless, I earnestly ask mycologists that, if I have omitted any diagnoses known to them, they would most kindly transmit them. For the intention is to print missing diagnoses or those of new fungi every year, and in such a way that individual additions can be inserted into their own proper places. Furthermore, I would like to ask mycologists to use only Latin names for host plants and to express the dimensions of fungi only in millimeters and micromillimeters *).

IV. Where I could find complete diagnoses, I transcribed them from a single author or rendered them into Latin; but often I derived them from two, rarely more, authors who complemented one another. I did not do this, however, unless I was entirely certain that the different notes of the authors pertained to the same species. If otherwise, I noted the sources or doubts. I shortened most diagnoses that were too long, by removing notes of lesser importance, and more rarely, I reformed them.

V. I have attempted, as much as possible, to refer all species known to date to genera that have been very recently defined more strictly. However, I highly recommend to students that they do not search for their species under one genus alone, but also under all related ones; for it has not rarely happened by chance that I have been forced, due to ignorance of certain characters, to assign to genera that were not strictly their own, even if related, some species that I had not personally seen. Compare, for example, species of Hypoxylon and Nummularia, Didymella and Sphaerella, Laestadia and Physalospora, etc., etc. *).

*) In the present work, as in my previous ones, the micromillimeter (= 1/1000 of a millimeter), which is expressed by the symbol µ, is used for measuring the smallest organs. Where numbers are present, with the sign ≍ interspersed, the first number denotes the maximum length, and the second the maximum width of the organ or part of the fungus being discussed.