188 



no. 4T53 ! ; Thum. Mycoth. univ. no. 1286!; all forming part 

 of the same collection, Jan. 1878). 



On the same branches is Botryodiplodia Chionanthi, Grove, 

 which is a true Botryodiplodia, having 2-12 pycnidia in each 

 group, but is evidently the same as was issued by Ellis as no. 

 2531! and named Diplodia ChionantJii, C. & E. in Grevill. 1877, 

 vi. 3. In no. 2531 the- pycnidia are often single, and only 

 occasionally gregarious, 2-4 together. 



Cooke's figure (I.e.) is very exact, though no spores quite so 

 large as he shows could be discovered. Dothiorella is in many 

 cases only at an early stage of Botryodiplodia; thus D. fraxinea 

 belongs to B. Fraxi?ii, and D. vyrenophora to B. pyrenophora, 

 etc. So here, probably, Dothiorella diatrypea belongs to 

 Botryodiplodia Chionanthi, and the following species, D. Crepini, 

 may belong to Diplodia mutila, Fr. & Mont., which shows some 

 signs of being really a Botryodiplodia. 



574. Phoma Crepini, Speg. Sf Roum. 



Dothiorella Creptni, Groove. 



? Dothiorella populnea, Thiim. Pilzfl. Sibir. no. 791 (1880). 

 Saec, Sy 11 . ill 237. 



Pycnidia single or crowded in erurapent botryoid groups of 

 3-12, girt by the erect laciniae of the burst epidermis, immersed 

 in a common basal stroma, nearly free above, deep inky-black, 

 shining, globose, subpapillate, 100-300 fx diam., pierced by a 

 round apical pore, at length collapsed at apex. Spores very 

 numerous, minute, oblong-cylindrical, straight or curved, i.e., 

 sausage-shaped in profile, obtuse at both ends, faintly biguttulate, 

 2-5-4 x 1-1*5 p.\ sporophores cylindrical, straight, erect, 



crowded, about twice as Ion? as the spore or even more so. 



(Fig. 8). 



* • 



D. Crepini, horizontal section of stroma X 40; a. a, bases of pycnidia; 



6, cortex of host ; c, stroma. 



On bark of dead branches of Popvlus fastigiata, near Malmedy 

 (Roum. Tung. sel. Gall. no. 654!). On bark of dry branches 

 of P. dilatata, Belgium (Thiim. Mvcoth. univ. no. 1681 !). On 

 dry branches of P. tremula, Germany (Fckl. Fung. Rhen. no, 



2566!). 



The spores are produced successively from the apex of the 

 sporophores, and sometimes remain for a time in chains. There 

 is often, in a group of pycnidia, one large pyenidium surrounded 









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