96 



Forest Club Annual 



Gloeosporium 



This genus is characterized by waxy acervuli that are sub- 

 epidermal, cup-shaped or cushion-like, finally often erumpent, 

 pale or dark. Spores ovate-oblong, continuous, hyaline, often 

 occuring in waxy masses. The basidia are typically rod-like or 

 thread-like and fascicled. See fig. 22. 



Gloeosporium acerinum West. 



Acervuli on the lower surface, dark-reddish, few. Spores 

 somewhat elliptical-oblong, erumpent in pale waxy masses be- 

 coming reddish. On Acer saccharinum. 



Gloeosporium scptorides Sacc. 



Spots white or yellowish, surrounded by dark lines. Spores 

 rod-shaped or fusoid, curved, becoming obtuse at each end, al- 

 ways continuous, hyaline, 20x2 microns. On Qucrcus macro- 

 carpa, Q. coccinea. 



Other species : 



Gloeosporium ccltidis E. & E. On Celtis occidentalis. 



Gloeosporium decipiens E. & E. On Fraxinus lanccolata. 



Mucedinalcs 



In this third order of imperfect fungi the hyphae are more 

 or less well developed and form a cobwebby or slightly compacted 

 mycelium, but rarely forming definite strata or stromata ; the 

 fertile hyphae are never enclosed in a pycnidium, typically super- 

 ficial. There are two quite distinct families as follows : 



/r\ Mucedinaceae: 



Hyphae hyaline or bright col- 

 ored, fragile, lax, cohering in fas- 

 cicles ; spores hyaline or bright 

 colored, of various shapes and 

 kinds of septation, borne on simple 

 or much branched hyphae. 



Ramularia 



Fertile hyphae well developed, 

 simple or vaguely branched, dentic- 

 ulate or roughened above. Spores 

 ovate to cylindrical, various, typic- 



Fig. 23. Ramularia. a. 

 Cluster of spores, b. Two 



magnified. 



All highly a % -2-many septate, hyaline, rarely 

 bright colored. See fig. 23. 



