The Literature on the Classification of the Hysteriales. 185 
Lophiostomaceae with more or less drawn-out perithecia 
(hysterothecia) and classified them with the Pyrenomycetes. 
He believed that these two families form a natural group, for 
which he proposed the name Hysterostomaceae. 
Of the fifty-seven or more genera which had fallen into the 
Hysteriales, von Hoehnel decided that only ten of them really 
belong there. He gave a key for these genera, and separated out 
a new genus (or at least sub-genus) Psiloglonium, for species of 
Glonium without subiculum. 
The disposition von Hoehnel would make of the genera to be 
removed from the Hysteriales may be indicated as follows: 
To the Phacidiales (see also (75)): Schizothyrium, Hypoderma, 
Hypodermella, Hypodermopsis, Lophodermellina, Nymano- 
myces, Lophodermium, Lophodermella, Aldona, Colpoma, 
Hysteriopsis, Sporomega and Synglonium. 
To the Ostropaceae (in the Discomycetes); Ostropa and 
Robergea; he would include these genera in a group with 
Stictis, Vibrissea, Schizoxylon, etc. 
To the Triblidiaceae (formerly placed in the Phacidiales) ; 
Pseudographis, Rhytidhysterium, Tryblidiella, Tryblidium, and 
Delphinella (= Pleodothis and Pleoglonis). 
To the Dothideales (see also (74)): Cycloschizon, Dielsiella, 
Hysterostomella, Mendogia, Parmulariella, Parmularia. 
To the Lembosiaceae: Actidium, Aylographum (= Lembosi- 
opsis), Hadotia, Morenoélla, Lembosia, Lembosiella. 
To the Sphaeriaceae: Delpinoélla, Erikssonia, Graphyllium 
(= Clathyospora), Merillopeltis, and Schizacrospermum. 
To the Patellariaceae: Baggea and Hysteropatella. 
To the Cenangiaceae: Angelina. 
To the Sordariaceae: Acrospermum. 
To the Lichens: Phragmographium. 
. To be discarded: Aporia. 
Table I includes the genera left by von Hoehnel in the 
Hysteriales, and gives the geographical distribution of the 
species so far as listed in the various volumes of Saccardo’s 
Sylloge. In this table ‘‘Asia” includes the adjacent islands. It 
may be seen that there are a total of one hundred and thirty-two 
species listed as occurring in Europe, and one hundred and 
eleven in North America. Saccardo had not, of course, included 
data from various lists of fungi for different regions; there are 
for example many more than twelve species common to both 
Europe and North America. It must also be remembered that 
several species included by Saccardo have been or will be shown 
to be only synonyms. 
The recent tendency to remove a number of genera from the 
Hysteriales merely indicates that the order had long remained 
