Entomogenous Fungi New to Britain. A. D. Cotton. 201 



Empusa (Entomophthora) aphidis Hoffman, in Fresenius, 

 Ueber die Pilzgattung Entomophthora, p. 84; Thaxtcr, 

 Entomoph. United States, pp. 175-177, PI- 18, hgs. 

 220-240; Jackson, Notes on the Aphides of Ross-shire, 

 p. 82. 

 Conidia ovoid to elhptical or subfusiform; commonly 

 asymmetrical and very variable, with papillate base and con- 

 taining numerous oil globules. Average measurements 25 x I2ju,, 

 maximum 16 x 40/^. Conidiophores digitate, often simple. 

 Hyphal bodies spherical, germinating in all directions and 

 giving rise to numerous contorted hyphae which grow into 

 conidiophores. Cystidia rather slender and tapering at their 

 extremities. Secondary conidia like the primary, or short 

 ovoid with a single large oil globule. Resting spores " spherical, 

 33-45 /x, in diameter and borne terminally or laterally on 

 hyphae" (Fresenius and Sorokin). Host attached to sub- 

 stratum by rhizoids, few in number, and usually terminating 

 in a disc-like expansion. 



Habitat. In Macrosiphum lactucae Schrank., on gooseberry, 

 Swordale, Evanton, Ross-shire, September 18, 1917; in 

 Macrosiphum allii Jackson, on Allium Porrum, Swordale, 

 Aug. 12, 1918; in Rhopalosiphum lactucae Kalt., on goose- 

 berry, Swordale, Aug. 12, 1918. Coll. D. J. Jackson, Sept. 

 1917, and Aug. 1918. 



In alluding to this species Miss Jackson makes the following 

 notes in her paper referred to above: The species is very 

 common and many Aphides are killed by it. Individuals in 

 which the fungus is present are easily distinguished by the 

 dull ochreous colour and opaque appearance, which is quite 

 different from the shining look of healthy specimens. They 

 possess also a rough appearance due to the skin being distended 

 all over into numbers of small elevations, each elevation being 

 caused by a spherical spore-cluster (of which the body is entirely 

 made up) pushing the skin outwards. Aphides killed by this 

 fungus remained adhering to the under side of the gooseberry 

 leaves. 



Empusa (Triplosporium) Fresenii, Nowakowski, Entomoph. 



p. 171, PI. xii. figs. 115-125; Thaxter, Entomoph. 



United States, pp. 167-169, PI. 16, figs. 106-140. 

 Conidia nearly spherical to short-ovoid, often with a short, 

 truncate or commonly slightly papillate base; with granular 

 contents; without large fat globules, and slightly smoky in 

 colour; 15 x 18—18 x 20/a. Conidiophores simple, arising 

 directly from small, spherical hyphal bodies of a yellowish 

 colour. Cystidia not observed. Secondary conidia of two 



