Lyman. — Studies of Hymenomycetes 
PLATE 19. 
Corticium alutaceum. 
Fig. 22. Section of hymenium. Basidia with from 4 to 7 spores. X 550. 
Fig. 23. Mature basidiospores. X 990. 
Fig. 24. Germinating basidiospores. X 600. 
Fig. 25. Diagrammatic representation of primary mycelium showing origin 
of secondary mycelium. X 56. 
Fig. 26. Origin of clamped secondary hypha from unclamped primary hypha. 
X 990. 
Fig. 27. Secondary hypha showing enlarged distal ends of many cells. 
X 550. 
Fig. 28. Conidia-bearing hypha. X 660. 
Fig. 29. Conidiophore with several mature conidia becoming detached and 
one in process of formation. X 2300. 
Fig. 30. Conidiophore with terminal conidium. Shows bilateral arrange¬ 
ment of conidia when the conidiophore is immersed in or lies upon 
the surface of the hanging drop. X 990. 
Fig. 31. Old conidiophore breaking up into an oidium chain of spores. 
X 990. 
Fig. 32. Aerial conidiophore showing conidia arranged radially instead of 
bilaterally, adjacent conidia frequently lying in a parallel direc¬ 
tion in groups of two or more. X 990. 
Fig. 33. Conidia swelling preparatory to germination. X 1200. 
Fig. 34. Germinating conidia. X 1200. 
Fig. 35. Primordium of bulbil. End of primordium sometimes curves in 
helicoid fashion. X 2300. 
Fig. 36. Hypha showing numerous bulbil primordia. X 550. 
Fig. 37-40. Stages in formation of bulbil. Figure 40 is a mature bulbil. 
Fig. 37-38, X 550; fig. 39-40, X 390. 
Fig. 41. Section of mature bulbil showing dense granular cell contents and 
small intercellular spaces. There is no difference between inter¬ 
nal and external cells. X 390. 
Fig. 42. Abnormal bulbil reduced to a chain of cells. X 390. 
Fig. 43. Germinating bulbil after 20 hours in drop culture. X 220. 
