2 55 
Peculiar Spore-forms of Botrytis. 
of invagination may be compared with the extrastelar interpretation. 
The parallel becomes more striking when it is recalled that in 
Onoclea germanica an epidermis and air may he included within the 
stem through invagination at a leaf-gap. 1 
Moreover the peculiar arrangement of the tissues in ring- 
fasciations, with xylem lying between two zones of phloem, peri- 
cycle, endodermis and ground tissue, is singularly suggestive of the 
typical amphiphloic solenostele; and the gradual dwindling and 
final disappearance of the internal ring of bundles in the Mummy 
Pea when traced downwards may be compared with the similar 
dwindling of the central tissues in a solenostele until the protostelic 
condition is reached. 
Although the value to be attached to such a comparison is 
necessarily slight, yet the general implication seems to be in favour 
of the view that medullation, like ring-fasciation may arise in 
different ways in different cases : (1) by the intra-stelar method, or 
direct tubulisation ; (2) by the extra-stelar method, or invagination. 
1 E. C. Jeffrey “The Pteropsida.” Bot. Gaz., L., p. 400, 1910. 
Cambridge, 
August , 1911. 
PECULIAR SPORE-FORMS OF BOTRYTIS. 
By S. Reginald Price, B.A. 
(Late Scholar of Clave College , Cambridge). 
[With Eight Figures.] 
OME material of Botrytis, exhibiting certain spore-forms of 
which no description has been found, has recently been 
umder my examination. 
Well developed sclerotia, black in colour and varying in length 
up to 12 or 14 mm. were found on the dead and dry stem of an 
Umbellifer, near Wellington, Somerset, early in April, 1911. From 
the character of the stem, and the flora of the spot examined later 
in the summer, there is little doubt that the host plant was the 
Hemlock, Contain maculatum. The sclerotia were freely giving 
rise to conidiophores and conidia, and were identified as belonging 
to Botrytis cinerea var. sclerotiophila Sace. These sclerotia were 
formerly known by the name of Sclerotium durum. The general 
