July i9i3.i g. K01DZUMZ—SPICJLEB1UMBETTJLA0EARUM 145 



Folia supra pubescentia snbtus cano vel ferrugineo- 

 tomentosa, rarius late elliptica basi subito breviter cuneata ; 

 nervi sectmdarii in utroque latere 8—10 ; ramulis petiolisque 

 ferrugineo-tomentosis. 



Nom. Jap. Yezo-yamahannoki. 



Distr. Sibiria, Manshuria, Karatschatka, Yezo, Kurile, 

 Sanghalin, Nippon borealis. 



var. tinctoria (Sargent) 



Alnus tinctoria, Sargent, Gardn. Forest X. (1897) 472, 

 fig. 59. 



Alnus incana, var. tinctoria, Winkl. 1. c. 123. 



Folia supra pilosa subtus glaucina, praesertim ad costas et 

 venulas pubescentia, nervi secundarii in utroque latere 8-10 ; 

 ramulis petiolisque plus minus pubescentibus. 



Xom. Jap. Yama-hannoki. 



Distr. Japonia, Korea, Manshuria. 



a typica (Call). 



Folia obtuse lobulata utriuque magis minusve pubescentia 

 vel pilosa interdum glabrescentia. 



b obtusiloba (Call). 



Folia obscuriter lobulata. 



c glabra (Call). 



Folia obtuse lobulata basi angustata subtus glabra. 



d hirsutoides. 



Folia obtuse lobulata, utrinque densius pubescentia usque 

 tomentella. 



e acutiloba. 



Folia ovata acuta, basi truucata raro rotundata vel leviter 

 cordata, supra glabrescentia subtus secus costas pubescentia. 



Hab. Prov. Simotsuke : Nikko. 



6. Alnus (Gymnothyrsus) borealis sp. nov. 

 Species A. subcordatae C A. Mey forsan affinis, sed 

 ramulis foliis junioribusque subtus ferrugineo-tomentosis ; 

 lamina late elliptica basi semper rotundata ; strobilis sessilibus 

 glomeratis ; gemma glabra viscosa facillime dignoscenda. 



