were arranged. When the number of species on a single host is large, they are ai- 

 ranged alphabetically under the pioper orders and, where there are many species of 

 some orders and but few of others, the latter are placed under the general heading, 

 Miscellanea. In many cases fungi were originally described as growing on a cer- 

 tain genus without mention of the species and, hence, in searching for the fungi to 

 be found on a given species, one should also examine the list of fungi placed under 

 the general heading, sp. indet., at the end of different genera. In some cases, like 

 Nyssa and Lagerstrocmia, it is very probable that the species here placed under 

 sp. indet. really belong under N. mttltijlora and L. Indica, but, as cases of other 

 genera are doubtful, we have thought best to adhere to the indefiniteness of the 

 original publications. 



It s'i:nild be borne distinctly in mind that the index purports to include only 

 thosj species of parasitic fungi which have been recorded as occurring in extratrop- 

 ical North America. The word parasitic is here used to include many saprophytes, 

 properly speaking, but ubiquitous species, like some moulds, have not been included. 

 The fungi included have many synonyms, but, as a rule, tve have given only those 

 synonyms which have appeared in print in connection -with the record of the 

 occurrence of the species on particular hosts in North America* omitting other 

 svnonyms which have been used in works on the fungi of other countries. In a 

 few cases, where confusion might otherwise arise, a s\ nonym not, as yet, used in 

 works on North American fungi is given in italics. Synonyms are indicated by 

 braces, and are given, with some exceptions, in chronological order, but it, of 

 course, does not follow that the latest name is always to be preferred to others, 

 although that is more frequently the case. In the index, as elsewhere, discretion 

 has to be used, and in cases of what we knew positively to be errors in the 

 determination of the hosts or the fungi themselves we have inserted corrections, and 

 in other doubtful cases we have called attention to disputed points by means of interro- 

 gation marks. An interrogation before a name signifies that it is doubtful whether 

 the fungus in question really occurs on the host named ; one after the name means 

 th it the determination of the fungus rs uncertain ; one after a name in a brace, that 

 it is doubtful whether it is really synonymous with the other names in the same 

 brace. Names of undescribed species from lists and catalogues have usually been 

 omitted except where necessary to complete the synonymy. The abbreviation, 

 Auct. Amer., lias been used in a number of cases in which names have frequently 

 been used by writers on North American fungi without proper authority, although 

 tiie species referred to in these cases are well known. 



In the case of fungi to whose different stages different names have been given, the 

 names of secondary stages (conidia, pvcnidia, etc.), when it was thought necessary 

 t) give them at all, have been placed in alphabetical order and, in the hosts infested 

 by a large number of fungi, under the orders to which so-called form-genera are 

 usually assigned. The complications of Uredineae are so great that we have not 

 attempted to show here the connection of different forms which can be learned only 

 from special works on that subject. In most instances the uredo name is not given 

 unless it differs widely from that of the teleutosporic form or unless, for some special 

 reason, to avoid confusion in the svnonymy. Aecidial forms have been kept distinct 

 on the same principle. 



