ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 155 



Mycolog'ical Notes.*— C. G. Lloyd has issued a series of notes and 

 descriptions relating to a variety of fungus forms. In discussing 

 species of Cordyceps he suggests that specimens from Brazil found on 

 locusts, and considered by Hennings as new species, are probably 

 identical with C. sphingiuyn, which grows on moths and was originally 

 collected in the West Indies. The species on scale insects are also 

 reviewed. Lloyd has lately received plants of Lysurus from Australia, 

 and takes the opportunity to sketch the history and occurrence of 

 L. Gardneri. It has been introduced into America and Europe from 

 more tropical countries, but is only an alien plant. Paulia resinacea, a 

 very peculiar new Gasteromycete from Australia, is described and 

 figured, as also a conidial clavate Xylaria, which is peculiar in being 

 developed from a sclerotium. Other plants commented on are Hydnum 

 Henningsii, with yellow flesh and brown teeth, from S. Africa ; Stereimi 

 elegmis, with a long tap-root, from Australia ; Irpex vellereus, like a 

 Raduhim in young stages ; Exidia japonka, with hymenial papillge 

 formed of fasciculate hyphjB. Species of PoJystidus, Guepinia and 

 Bovistella are also reviewed. 



Mycorhiza of Forest Trees. f — In discussing the growth of forest 

 tree-roots, W. B. McDougall gives the results of his observations on 

 their mycorhizal relations. Two conditions he finds are necessary for 

 the formation of mycorhizas : " the roots must be growing and the 

 proper fungus must be present and in an active and receptive condition." 



He concludes that as mycorhizas are produced largely by the later- 

 fruiting mushrooms, they are formed in the autumn rather than in the 

 spring. And he also states that these fruit bodies are usually 

 produced after the fungi have become attached to roots. He identifies 

 as mycorhizal : Bussula f(etentula, for oak trees ; Seleroderma vulgare, for 

 limes : and probably Laccaria ochropnrpurea, for hickory. In the case of 

 these trees no mycorhizas were found in the spring, but they appeared 

 after the first of July whenever the roots were growing v;ell. 



Diseases of Plantation Rubber in Malaya. | — F. T. Brooks has 

 published notes on the occurrence of fungus diseases of Hemi as 

 observed by him ; these are Fomes Ugnosus, Folyporus rugulosus, 

 Hymenochsete noxia, with a number of microf uugi, such as Botryodiplodia, 

 Glcesporium, etc. He also describes thread blights, a fruiting stage of 

 one having been determined as Gyphella Herese Massee. Bark diseases 

 were also looked for, but the author failed to find Phytophthora 

 Faheri, which had been recorded previously from Malaya. 



Disease of Lombardy Poplar.§ — G. G. Hedgcock and N. Rex Hunt 

 have described a new fungus outbreak in the United States on this tree 

 due to Dothicldza popuha. It attacks the trunks, limbs and twigs of 



* Cincinnati, Ohio, No. 43 (1916) pp. 589-604 (1 pi. and figs.). 

 t Ann. Journ. Bot., iii. (1916) p. 391. 

 X Ann. Appl. Biol., ii. (1916) pp. 209-26. 

 § Mycologia, viii. (1916) pp. 300-8 (2 pis.). 



