33 



VI, Pucciniastrum Miyabeanum** sp. nov. 



Uredospores. — Sori hypophyllous, minute, scattered, pseudoperidia hemispher- 

 ical, persistent, ostiole minute with no projections, spores round, ovate 

 or oblong, echinulate, 18-24 fi long, 12-15 fi broad, commonly 18 x 12 

 ju, often as large as 24x15 t a, Contents orange-yellow. 



Teleutospores. — Sori mostly hypophyllous, insignificant, formed under the 

 epidermis; spores oblong or ovate, 15-24 /i long, 15-20 /j. broad, 

 divided into many smaller daughter spores, mostly by longitudinal 

 septum ; contents orange color, membrane colorless. 



Hab. On Viburnum furcatum Bl. (a $/ % V). September to October. 

 Botanic Garden, Sapporo (Hiratsuka, Miyabe, G. Yamada.) ; Moiwasan, 

 near Sapporo (G. Yamada). 



Kemarks. — This species is not so common as those species already mentioned. 

 Uredospores are formed on the under surface of the leaf, covered by 

 a hemispherical, somewhat depressed pseudoperidia which are much 

 smaller than those of Pucciniastrum Styracinum sp. nov. The ostiole 

 is inconspicuous with no projections ; paraphyses are absent; but rarely 

 a few sterile cells which morphologically may correspond to the paraphyses 

 may be found., 



Teleutospores are formed intercellulary under the epidermis on the 

 under surface of the leaf ; but rarely they are also formed singly between 

 the upper palisade cells, as has already been remarked in the case of 

 P. Styracinum. (Fig. 11.) Sometimes the teleutospores are formed 

 among the ureclosori as in the case of P. Tilice. 



Other morphological characters of the species are quite similar to P. Tilice 

 and P. Styracinum already described and it is unnecessary to repeat 

 them here . 



Hirosaki, Prov. Bikuoku, 

 March 1898. 



EXPLANATION OF FIGURES IN PLATE !!. 



IV. Pucciniastrum Agrimonies (BOO Bietel. 

 Fig. 1, uredospores; Fig. 2, vertical section of the leaf showing the 

 development of the teleutospores, epidermis ep. f stomata sto., teleutospores 



** Dedicated to my most honoured teacher, Prof, Dr. K. Miyabe of Sapporo Agricultural 

 College, Japan. 



