106 THE JOUHNAL OP BOTANY 



of larch and birch. It has been recorded from the south of France, 

 Holstein, and Colorado. 



P. NUCLEATUM Eex. Found for the first time in Britain by 

 Dr. A. Adams near Looe, Cornwall, July 1911, on dead wood. 

 Mr. N. Gr. Hadden has also obtained it near Lynton, N. Devon, in 

 August 1915 (see Journ. Bot. 1916, p. 200). 



P. carneuvi Gr. Lister & Sturgis. Found in abundance hj Mr. H. 

 W. Howard in Bramble thickets, near Thorpe, Norwich, in late 

 summer and early autumn 1916, 1917, and 1918 (see Journ. R. 

 Microscop. Soc. 1917, p. 265, pi. xviii.). Except a gathering made 

 near Lisbon by Dr. C. Torrend in December 1907, the only other 

 record for P. carneum is Colorado. 



P. BRUNNEOLUM (PliiU.) Massco. A single growth was found by 

 Miss M. Rea near Lisburn, County Down, Jul}^ 1917. The specimen 

 consists of gloss}'' brown hemispherical or elongated sporangia on a 

 dead herbaceous stem ; the spores have not matured well, but enough 

 have developed to leave no doubt as to the identit}^ of the species. 



P. hrunneolum has been obtained from California, Chili, New 

 South Wales, and Portugal. 



P. ATJEiscALPiUM Cooks. First found in Britain by the Rev. W. 

 Cran in August 1912 on a mossy trunk near Skene, Aberdeen, in 

 which district he has repeatedly obtained it since, and also at Lesmoir, 

 W. Aberdeenshire. Members of the Mycological Society found it in 

 the Altyre Woods, Elginshire, in September 1912. 



P. CBATERiFORME Pctch. Mr. Cran has obtained this repeatedly 

 on the bark of living trees since 1904, near Skene, Aberdeen. It has 

 also been recorded from Ceylon, Japan, Antigua, and S. Nigeria. 



P. coxNATUM (Peck) Lister. A single gathering of what appears 

 to be this species was made in November 1898 by Mr. Edgar Saun- 

 ders ; otherwise P. connatum has hardly been recorded beyond 

 N. America. 



P. VERXUM Somm. var. ibidescens, nov. var. This small iri- 

 descent form is very constant, and appears regularly on dead leaves, 

 especiall}'- holly-leaves, in Epping Forest, Essex, in autumn and 

 winter. It is distinguished by the sporangia being scattered and 

 having scanty or no deposits of lime in their walls, by the lime- 

 knots enclosing unusually large lime-granules, and by the dark 

 brownish-purple spores having a pale patch of dehiscence. It has 

 been found in Bedfordshire, H^ertfordshire, Norfolk, Nottinghamshire, 

 and North Devon, and also in Holstein. 



FuLiGO SEPTICA Gmcl. var. rufa (Pers.) G. Lister. This dull 

 red variety is not uncommon and has long been recognized. Mr. H. 

 J. Howard finds from his experience that it always arises from cream- 

 coloured Plasmodium. For convenience, it would seem well to mark 

 it with a varietal name. 



F. SEPTICA var. CANDIDA (Pcrs.) G. Lister. The white variety is 

 more abundant than the red, and arises from a white or cream- 

 coloured Plasmodium. 



DiDERMA AEBORETM G. Lister & Fetch in Journ. Bot. 1913, p. 2, 

 pl. 524. fig. 2. The first British gathering of this arboreal species 

 was made by Mr. Cran in Oct. 1910 near Skene, Aberdeen, and on 



