Palaeontologie. — Algae. — Eumycetes. 125 



"Dragon-tree" of the "Kentish Rag". (Geol. Mag. N°. 568. 

 p. 467—468. London 1911.) 



A short account of the nomenclatorial history of this fossil, and 

 a Suggestion that a new combination, viz. Benstedtia Benstedi (König) 

 Knowlton should be applied to it. M. C. Stopes (London). 



Stopes, M. C, The Name of the 'Dragon-tree'. (Geol. Mag. 

 N°. 568. p. 468—469. 1911.) 



Pointing out that my previous paper on the 'Dragon-tree' (Geol. 

 Mag. Vol. 8. p. 55—59) had demolished the theories that it was a 

 Monocotyledon, or a Cycad and had shown it to be merely some 

 rotten coniferous woody remains, too imperfect for specific diagnosis; 

 and that consequently it was needless to give it a name. 



M. C. Stopes (London). 



Johnson, N. M., Ecological Terminology as applied to 

 Marine Algae. (Scott. Bot. Rev. I. p. 44—46. 1912.) 



The author points out that Warming (Oecology 1909) and 

 Borgesen (Faroes, 1905) appear to have different concepts as to 

 the scope of plant formation and association as applied to Algae. 

 He indicates a method of ecological Classification based on his in- 

 vestigations in Scotland (County Fife) on Firth of Forth: Nereid 

 formation of Algae; marine (halo-nereid) sub-formation; littoral region: 



District I: rocks and sandy beach, creeks and isolated rocks: 



1) Fucaceae association with F. vesiculosus (without bladders), 

 dominant between high and low water mark. 



2) Plant societies of: Callithamnion scopulornm, Enteromorpha 

 compressa, and Porphyra laciniata. 



Dist. II: A, a series of creeks; B, a bay with rock areas: 



A. 1) Fucaceae association with F. vesiculosus dominant. 



2) Plant societies of: F. serratus, F. spiralis, Pelvetia cana- 

 liculata, Enteromorpha compressa, etc. 



B. 1) Fucaceae association w. F. vesiculosus and F. serratus. 

 2) Plant societies of: Ascophyllum nodosum, Callithamnion 



scopulorum and Gigartina niamillosa , etc. 



W. G. Smith. 



Petch, T., On Lasiodiplodia. (Ann. Royal Bot. Gard. Peradeniva. 

 IV. 7. Sept. 1910.) 



An account is given of the work of various observers on the 

 unwieldy group of species of the genus Diplodia, parasitic on Cacao. 

 Much confusion has arisen, with the result that it was believed that 

 each Cacao-growing country had its own peculiar parasitic Diplodia. 



The genus is critically discussed, with a view to putting matters 

 on a clearer basis. A bibliography is given. W. A. Brenchley. 



Petch, T., Thielaviopsis paradoxa (de Seynes) v. Höhne 1. (Ann. 

 Royal Bot. Gard. Peradeniya. IV. 7. Sept. 1910.) 



A very füll historical account of this fungus is given, the work 

 of several previous observers being summarised in detail. 



Experiments show that the mature spores will not germinate 

 in water, but grow well in nutrient Solutions of cane sugar in tap- 



