ADDENDA 561 



ADDENDA 



DURING the progress of this book through the press, various 

 diseases new to this country have been observed. The same 

 is true of other countries. Some of the more important are 

 noted below. 



Twig and bud disease of lilac. Klebahn has quite re- 

 cently described the various parasitic fungi and bacteria 

 attacking the lilac (Syringa vulgaris}. Amongst others, 

 Phytophthora syritigae (Klebahn) attacks and kills the tips of 

 the shoots and also the buds. Large, elongated, wrinkled 

 patches occur on the internodes of the stem. Conidia are 

 produced on the surface, and numerous oospores are formed 

 in the young tissues of leaf- and flower-buds. 



Mycelium intercellular, branched, aseptate, thread-like 

 haustoria enter the cells. Sporangia egg-shaped or ellipsoid, 

 40-75X30-42 /a, developed sympodially ; swarm-spores egg- 

 shaped, 9-11X8-9 //,, unsymmetrical, with two cilia attached 

 laterally, the shorter one, 16-18 ft pointing forwards, the 

 longer one, 23-30 p, pointing backwards. Oogonia and 

 antheridia formed in the tissues of the host ; oospores solitary 

 in the oogonia, globose or rarely oval, 18-36X17-25 /z, wall 

 thick, yellowish, smooth. 



Klebahn, H., Krankheiten des Flieders, p. 18 (1909). 



TREMELLA (DILL.) 



Gelatinous, tremelloid. immarginate, generally smooth (not 

 papillose as in Exidid), basidia globose, longitudinally cruci- 

 ately quadripartite, each quadrant of the basidium elongating 

 into a long, stout sterigma ; spores subglobose, continuous. 

 Conidia are produced in the sporophore in some species. 



Tremella frondosa (Fries.) occurs on the trunks of trees, 

 oak, etc., that are still living, and is suspected of parasitic 

 tendencies, but there is no definite evidence on the point. 



Gelatinous, tufted, large, 3-4 in. high and broad, sometimes 

 2 N 



