194 THE JOURNAL OF BOTANY 
theory of tuberation being always dependent upon some species 
of Fusarium. Prof. Keeble mentioned that Miss Longman’s cul- 
tures had been derived Sate & single spore, froma hanging drop, 
and upon material simiine according to modern bacteriological 
methods, 
At the same meeting was read a second paper by Mr. 
Horne, “On the Structure and Affinities of Davidia involucrata 
Baill.” The paper dealt with the shee ture and affinities of a genus 
which has been referred by various authorities to Combretacee, 
Cornace@, and Hamamelidacee, and was based upon material 
brought by Mr. E. H. Wilson from Szechuen in 1904. Evidence 
is advanced in favour of interpreting the in florescence as consist- 
ing % a number of congenitally-fused, apetalous, multistaminate 
wers, or of male and in addition a single obliquely- 
stunted apetalous, hermaphrodite flower with epigynous stamens 
rranged in series. From a detailed study of the flower, ovary, 
ovule, and seed, the aut hee is inclined to believe that Davidia is 
‘crear ms related to Alangium and Nyssa, and still more distantly 
related to the Araliacee: that the genus occupies a s 
isolated oe owing to having pursued an ind dent course 
of development the plexus of primitive groups, which in- 
cluded the ancestral forms of the Araleacee, Nysse@, and 
the meeting of the Linnean Society on April 1st, Dr. Marie 
Stopes exhibited several microscopic slides and micro-photographs 
of plant petrifactions from Japan. The petrifactions are of Cre- 
delian phenomena; and Mr. Arthur W. Sutton showed a large 
series of seeds, some being results obtained by crossing Pome 
arvense from the er of Jaffa in Palestine, with varieties 
of culinary peas, P. sa 
Tue Transactions foe the British Mycological Society for the 
season 1908 (vol. iii. pt. 2, price to non-members 10s. 6d.; pub- 
lished 31st March) shows a satisfact ctory amount of work and 
contains many papers of interest, including the description of a 
paper on new or rare microfungi. ‘“ Fungus Notes for 1908,” are 
-by the veteran Dr. meek e, who also asks “ What is Hygrophorus 
Clarkit Beck. & Br.?” and answers “ nobody knows”; to this 
paper a “note” is appended which we, in common with those to 
whom we have shown it, fail to understand. Mr. Charles Cross- 
land gives a long list of “Omitted Asci measurements of some 
British Discomycetes”; and Mr. A. D. Cotton has what is 
evidently an important ‘paper on Marine Pyrenomycetes. Mr. 
