Kern: A Notable Species of Gymnosporangium 209 



It is, however, in the number and location of the germ pores 

 that the new species is especially notable. It has from five to 

 seven large, scattered pores in each cell (Fig. i, b). No other 

 species of Gymnosporangium has ever been observed by the 

 writer with more than two germ pores. A number of species 

 have been reputed to have four in each cell,* but on very careful 

 examination the writer has never been able to verify this asser- 

 tion. Seven seems to be the usual number in the species under 



Fig. 2. a, Portion of green branch showing manner in which the sori break 

 forth between the scale-like leaves ; about three times natural size, b, Three 

 teliospores showing outline, uniformly thick walls and size and location of the 

 many pores, X 468. 



discussion, although a few were observed where only five or six 

 could be found. The fact that the pores are scattered is also 

 significant. In all other species of the genus they have some 

 definite arrangement, such as, near the septum in both cells, or 

 apical in the upper, and sometimes near the pedicel in the lower 

 cell. It may be further noted here that this character of numer- 

 ous scattered pores in the teliospores is not only new to the 

 genus Gymnosporangium but has never been known in any genus 

 of the family Aecidiaceae, which includes such well-known 

 genera as Puccinia, Uromyces and Phragmidium. 



* See Farlow, Anniv. Mem. Boston Soc. Nat. Hist., The Gymnosporangia 

 or Cedar-apples of the United States, pp. 13, 17, 18, 23. 1880. 



