South African Perisporiales. 
715 
on the same scale. Perithecia were drawn with Zeiss objective J) and No. 2 
ocular ; mycelium and spores with the same objective and a No. 5 ocular ; 
and all appendages of mycelium and perithecia with a No. 4 ocular. 
The colour of the mycelium, etc., is recorded as seen by transmitted light 
under the microscope, and the references are to Eidgway's "Colour Standards 
and Nomenclature." 
Peeispoeiaceae. 
Mycelium superficial, usually conspicuous and covering the substratum 
with a dark growth ; rarely absent and rarely forming a stroma. Perithecia 
formed on the mycelial hyphae or rarely on a stroma, black, more or less 
globose, astomous, asci numerous, usually aparaphysate. Spores very 
various. In some genera several forms of conidia are produced as well as; 
ascospores, and some, e. g. Cwpnodium, are very rich in the number of their 
conidial forms, and comparatively rarely produce perithecia. 
In a number of genera the hyphae of the perithecigerous mycelium bear 
small lateral processes, known as hyphopodia. These are very various in 
form, and are usually 1-2-celled. 
The Perisporiaceae chiefly occur on living leaves and young parts of 
plants ; several genera, however, are found on decaying vegetable matter. 
Key to Genera. 
A. Spores 2-celled. 
a. Aerial mycelium conspicuous. 
1. Perithecia containing a single ascus. 
2. „ „ numerous asci. 
0. Spores hyaline. 
X. Perithecia smooth. 
XX. Perithecia setulose. 
00. Spores fuscous. 
X. Perithecia smooth. 
XX. Perithecia setulose. 
h. Aerial mycelium none or poorly developed 
B. Spores 3- or more celled. 
a. Spores transversely septate. 
1. Spores hyaline. 
2. Spores brown. 
h. Spores muriform. 
Ballad YNA. 
Mycelium fuscous, septate ; hyphopodia continuous or septate ; mycelial 
setae long, rigid. Perithecia ovate- globose, black, stipitate, mono-ascate. 
Asci globose, 8-spored. Spores brown, smooth, one-septate. 
Balladyna. 
DimeriiS'porium. 
Dimeriella. 
Bimerium. 
Fhaeodimeriella. 
Parodiella. 
Zukalia. 
Meliola. 
Capnodium. 
