32 



V. Pucciniastrum Styracinum sp. nov. 

 (Fig. 7-13.) 



Uredospores. — Sori hypophyllous, small, rounds scattered, orange-yellow 

 pseudoperidia hemispherical, persistent, with ostiole at the top ; spores 

 roundish, ovate or oblong, 19-26 y. long, 14-15 fi broad, usually 

 22 x 15 fa echinulate, contents orange color. (Fig. 7-9.) 



Teleutospores. — Sori mostly hypophyllous, yellowish-brown ; spores intercellular, 

 roundish or oblong, 20-30 jut long, 11-17 p. broad, divided in various 

 ways into many smaller daughter cells ; contents light yellowish orange, 

 membrane colorless. (Fig. 10-13.) 



Hab. On Styrax Obassia Sieb. et Zucc. (^ f p -y-tfp). September to 

 November. Sapporo (Miyabe, Tokubuchi, Hiratsuka). On Styrax 

 japonica Sieb. et Zucc. (■*.&/ a? ). Iwate, Prov. Kikuchiu (Y. Ta- 

 kahashi). 



Remarks. — The leaves attacked by this iungus shew on their upper surface 



light-yellow discoloration, but later when the teleutospores are formed, 



they become dark-brown to black. On the under surface just opposite 



to these discolored spots, small nredosori with orange colored uredospores 

 are developed. (Fig. 7-8.) 



Among the uredosori there may be found a small number of clavate 



paraphyses-like sterile cells, mixd with the uredospores; and rarely some of 



these cells have orange-vellow contents characteristic to the uredospores. 

 (Fig. 9.) 



As to the morphological characters of the uredo, they are analogous to 

 those of Pucciniastrum Tilice, Miyabe already alluded to in the previous 

 paper, (S) 



The teleutospores are formed on both surfaces of the leaf ; on the 



under surface, they are formed intercellulary in groups just under the 



epidermis separating it from the underlying parenchyma cells. (Fig. 10.) 



While on the upper surface, on the contrary, mostly single mother 



teleutospore is formed between the palisade cells pressing them aside 



to bo tli sides causing there-by dark-brown discoloration of the cells ; the 



epidermis remains in the normal position fixed to the palisade cells. 



(Pig. 11.) The teleutospores are variable in size and shape, being 



divided into many daughter cells either by longitudinal or horizontal 



septa. (Fig. 12.) The germination of the teleutospores has not yet 

 been observed. 



\) Botanical Magazine, Vol. XI, No. 126, p . 48. 



