THE FUNGI WHICH CAUSE PLANT DISEASE 



559 



'' / / / 



Fig. 376. — P. funerea. A. Spores. 

 B. A j'oung mycelium. C. Hypha 

 of an older mycelium. After Reed. 



P. funerea Desm. 



Acervuli scattered, punctiform, blackish, subepidermal, erum- 

 pent; stroma depressed, white; 

 conidia oblong, fusoid, 5-celled, 

 constricted at the septa, the three 



central cells fuscous, the others t j ^ \\ a, 



hyaline, 22-32 x 6-8 m, with 2-5 "2 W/T 



recurved hyaline spines, 10-15 x 

 0.7-1 n; conidiophores short, 5-9 x 

 1-1.5 M- 



It is found on various conifers 

 causing disease and is a common 

 saprophyte. In America it causes 

 a stem spot or anthracnose of ginseng,*^ girdling the petioles. 

 The culture characters were studied by Reed.'** 

 P. guepini Desm. var. vaccinii Sh.^'' 



Acervuli minute, punctiform, convex, black, subepidermal, 



erumpent; conidia el- 

 liptic and somewhat 

 imequilateral, about 

 20 n long; central cells 

 dark, the two end cells 

 hyaline, the apical cell 

 with 3-4 filiform setae 

 22-35 n long, the basal 

 with a short hyaline 

 appendage, 6-12 j«. 



Common on fallen 

 leaves of cranberries, 

 and associated with 

 rot of the berries. It 

 is common on tea 

 causing a serious dis- 

 ease, also on Camellia, 

 Magnolia, Citrus, 

 Rhododendron. 

 P. uvicola Speg.^** 

 Acervuli globose, lenticular, black, subepidermal, erumpent. 



Fic. 377. — Pestalozzia guepini vaccinii; a, a conidium 

 having an apical appendage with three branches; 

 6, a conidium having an apical appendage with 

 four branches; c, a germinating conidium; d, a ger- 

 minating conidium sending out two germ tubes. 

 After Shear. 



