1 86 The Scottish Naturalist. 



side of the leaf in the hope that a sclerotiet or a part of it may be 

 torn up along with the mycelium attached to it. If a piece is laid 

 on a slide, it will be seen how the conidiophores of the Peronos- 

 pora come out at the stomata. The cuticle must be stripped off 

 with a pincers near the edge of a black spot from the still green 

 portion of the leaf, after the disease has begun. One, two, three, 

 and up to nine stalks may be seen coming from a single stoma ; 

 and the question is what are these granular masses at the thin 

 ends of them? It has to be established that they are portions of 

 breaking-up sclerotiets, before it is fully proved that the sclerotiets 

 are resting states of the P. infestans. This cannot be done by any 

 one who wishes to try, till the autumn brings disease ; but during 

 the summer he may become familiar with the bodies in their 

 incubating stage, and will then be prepared to settle the question 

 whether disease commences with their germination. 



MTCOLOGIA SCOTICA-Supplement, 



By REV. J. STEVENSON and Professor J. W. H. TRAIL. 



{Continued from S. N., 1885,/. 130.) 



{All measurements, except where specified ', are in thousandths of a millimetre.) 



3040. Stagonospora Caricis (Oud) Sacc. Syll. Fung. III. 2471. 

 Perithecia numerous, but not in contact, subdermal, 140 

 diam. ; opening by apical pore, rather membranous, brown ; 

 spermatia nearly hyaline, fusiform with rather obtuse ends, 

 35-45 by 6, mostly 4-septate. 



On dead leaves of Car ex {Icrviqata ?). May. 



East. — — — Dee — — — — 



West. — — — — — — 



Drumoak, near Aberdeen. J. W. H. Trail. 

 Europe (Netherlands). 



3041. S. paludosa, S. and Sp. (Sacc. Syll. Fung. III. 2475, Trail, 

 Scot. Nat. 1885,^. 76). 



Perithecia numerous, but scattered, subdermal, nearly free 

 from surrounding tissues ; subglobose, with small ostiolum, 

 about 220 diam. ; spermatia pale yellowish, fusiform, 42-52 

 by 8, 7-9-septate. 



