14 



TIIK JOURNAL, OF BOTANY 



seem to be absolutely the same, although the external appearances are 

 not all described alike. Since, however, it is difficult to believe thai 

 there should occur on twigs of Holly several distinct species having 

 identical spores of the same unique character, the reasonable con- 

 clusion seems to be that the external appearance is dependent upon 

 outside conditions, while the spores remain essentially unchanged. 

 The Kew Gardens specimens may be described as follows : — 

 Perithecia scattered or aggregated, sometimes two or three being 

 contiguous and immersed in a parenchymatous atro-olivaceous stroma, 

 300-500 fj diam., globose or lenticular, dull black with a paler centre, 



immersed in the soft bark only, not sunk at the base in the w 1, 



covered by the shining epidermis and at length piercing it by a small 

 pore. Asci often curved, fusoid-oblong, slightly tapering above, 

 more so -below, truncate at the apex, aparaphysate, about 120x16//., 

 soon deliquescing. Spores intertwined and oblicpiely distichous or 



Fig. 1. Boydia inseulpta. 

 a, young- ascus, X400 ; b, immature 

 spore ; c, older spore, X 600. 

 (From Kew Gardens.) 



Fig. 2. Puccinia peucedani-parisiensis. 

 a, b, spores in air ; c, spore in water, 

 X600. 

 (From near Whitstable.) 



tristichous, elongated, doubly clavate-fusoid, i. e. attenuated at each end 

 and narrowed to a filament in the middle, arcuate or Sexuose, colourless, 

 filled with guttules and oily protoplasm, 80-100 X 8-9 /.i, at length 

 1 -septate in the narrow part. 



On twigs of Ilex Aqui folium var. Henclersonii, which it appears 

 to kill. Kew Gardens, Aug., Sept. (Fig. 1). 



The perithecia have a very thick but soft wall, formed of dark 

 greenish-olivaceous cells, either pseudo-parenchymatous or arranged 

 more or less in parallel chains : the stroma, when present, is of the 

 same character. The epidermis over them is for a long time un- 

 broken and rises like a "boil," as if full of whitish pus, surrounded 

 by a black border. At length the epidermis is pierced by a small 

 pore at the summit of the boil : when sev< ral perithecia are contiguous, 



