-Mil. BERKELEY ON THE POTATO MURKAIN. 31 



The peculiar characters of the species consist in the few 

 erecto-patent not forcipated or uncinated branches, the scat- 

 tered spores, and above all the torulose swellings which give if 

 somewhat the appearance of Gonatobotrys. The spores however 

 are not disposed round the knots as in that genus and Arthro- 

 botrys, or even confined to them. The only species wliich ex- 

 hibits anything of the kind is one which has been named Botry- 

 tis Urticse by Mile. Libert, and which indeed M. Desmazieres 

 considered as identical. It appears to me however that it is 

 quite distinct, the flocci being far more divided, the apices bifid, 

 and the colour, instead of white, a greyisii lilac. I have had 

 the opportunity, fortunately, of comparing specimens, which 

 occurred in the autumn, at Tansor, in Korthamptonshire, with 

 authentic individuals from M. Desmazieres. Various allied 

 species occur in similar habitats characterised by their large 

 spores. These, though closely allied to each other, difler in 

 their mode of ramification and in the form and size of their 

 spores. The best known of these is Botrytis parasitica, which 

 occurs on Cruciferas. Of this, as occurring on the leaves of 

 cabbages and Swedish turnips, I add a figure, as also brief 

 characters and figures of four undescribed species, for the 

 sake of comparison with Botrytis infestans. 



Botrytis ArennricF n. s. nivea ; floccis fertilibus sparsis superne dicliotomis, apicibus divari- 

 cato-furcatis non uncinatis ; sporis ovatis terminalibus. 



Hab. in pagina int'eriori ibliorum Arenariae trinervis. June, King's Cliffe. 



Botrj'tis Vicifp, n. s. nivea ; floccis fertilibus elongatis sparsis paree ramosis ; ramulis 

 bifidis non uncinatis ; sporis obovatis apiculatis terminalibus. 



Hab. in pagina inferiori foliorura Vicia; sativaD. June, King's Cliffe. A distinct species, 

 forming detinite purplish patches, occurs on Peas. 



Botrjtis arborescens, n. s. nivea ; floccis fertilibus superne ramosissirais di-trichotomis ; 

 apicibus subforcipatis ; sporis terminalibus minoribus subglobosis. 



Hab. in pagina inferiori Papaveris Rhrras, quod omnino destruit. June, King's Cliffe. 



The plants are attacked when quite young, and have a peculiar aspect by which they may 

 be known at a distance. 



Botrytis gin^lioniformis, n. s. nivea ; soris definitis ; floccis fertilibus superne ramosis, 

 ramulis curvatis sub apicibus dilatatis ganglioniformibus ; sporis minoribus terminalibus sub- 

 glol)osis. B. parasitica var. Lactucje, Berk Brit. Fung., No. 3S1. 



Hab. in pagina inferiore Lactucarum in hortis. May, King's Cliffe. 



Many other undescribed species occur, related to Bot. eflfusa, 

 Grev., but differing in various characters. All exercise a greater 

 or less influence on the health of the plant attacked. Dr. Mor- 

 ren informs us that beet-root has suffered from a species during 

 the present autumn, and also pear-trees. 



Ko good figure has yet appeared of Botrytis Bassiana, whicli 

 attacks silkworms : I have therefore availed myself of a sketch 

 kindly communicated by Dr. Montague. It will be seen that 

 it is extremely like Botrytis diffusa, Alb. and Schwein ; but tliis 

 is, I believe, more in appearance than reality, for perfect speci- 

 mens of that species exhibit a very complicated structure, each 

 head consisting of numerous lobes, each of which bears a num- 



