83 



On Betula pubescens it 

 forms the well-known witches- 

 brooms whose leaves have a 

 greyish bloom on the whole 

 of the under-side. Asci large 

 45-50 ,u 15-20,u, early Fil- 

 led with conidia, the stalk- 

 cell 15 ^'— 25 ," long, pointed 

 below as it is placed deep 

 between the epidermis-cells. 

 The conidia are oblong 5—7 ," 

 long, generally with 1—2 va- 

 cuoles. 



It has been identified by 

 Saccardo (Syll. VIII "'") and 

 Winter (II ") with T. turgida; 

 even Rostrup has once expres- 

 sed the same opinion (R 91 

 b =''''), but later on he has 

 maintained that the two fun- 

 gi must be well separated spe- 

 cies, partly because Betula 

 pubescens and verrucosa are 

 often found growing together, 

 one being severely affected, 

 the other not at all, partly be- 

 cause evident morphological 

 characteristics are found, which 

 separate them(R96o^^''see also 

 R 02 a "'^ c. icon.). Common. 



Betula pubescens. J. Esksr in Sailing!, Asmildkloster (Gad), Randers (Gad), 

 Silkeborg; S. Jonstrup Vang, Bollemosen, Bromme Plantage, Skelskor (Lind 

 07 b); Falst. Stubbekobing and in many other places. Betula nigra &, urtici- 

 folia. S. Landbohejskolens Have. 



Fig. 7. Taphrina betulina Rostrup on Betula 

 pubescens, from R 02 a. 



172. Taphrina turgida (Sadeb.) Giesenh., Syn: Exoascus turg. 

 Sadeb., Syll. VIII •"" partim (k Wt. II " partim., R 02 a ''\ 



Forms witches-brooms on the branches of Betula verrucosa, rare. 



Betula verrucosa. S. Tisvilde Hegn, Frederiksv<T:rk (^^/s 94 Job. Helms see 

 R 96 m"^). Falst. Horreby Lyng (Exc. ^t/e 11); B. Dynddalen (Neger 06). 



173. Taphrina betulae (Fuckel) Johanson 85, R 91 b -" 6. 02 a "^^ 

 Syn: Exoascus betulae Fuckel, Syll. VIII "i", Wt. IP. 



