AECIDIUM 337 



Diseased fallen cones remain spreading open, even in damp 

 weather, whereas the scales of sound cones remain closely 

 compacted together. 



Rees, Die Rostpilzfarmen d. deutsch. Cotiiferen, p. ioo. 



Aecidium phiilyreae (D. C). I observed this fungus infesting 

 every young shoot, also the leaves of a fine large plant of 

 Phillyrea latifolia in Pevensey churchyard, Sussex, in August 

 1907. The shoots were contorted and swollen, and rendered 

 conspicuous by the copious development of orange spores, 

 hence the pardonable mistake on the part of a local scientist 

 in statins; that the shrub had bloomed for the first time. On 

 visiting the place the following season it was found that the 

 plant had died during the interval. So far as I am aware 

 there is only one previous record of the occurrence of this 

 fungus in Britain. It is not rare on the continent. 



I am quite at a loss to account for the presence of the 

 fungus on this shrub, which had been growing in the same 

 place for twelve years and had never been attacked before. 

 Only the aecidium stage is known to exist ; of course this 

 does not prove that a teleutospore stage is not developed, 

 but careful search failed to discover one, or to suggest any 

 host-plant, other than decorative shrubs, likely to harbour one. 



Peridia densely crowded, more or less involute, whitish ; 

 aecidiospores subglobose or angular, wall colourless, minutely 

 warted, contents orange, 25-35 diam. 



Aecidium pscudo-cohimnare (Kiihn). The horn-like aecidia 

 grow in two rows on the under surface of leaves of Abies 

 pectinata and other species of Abies. Spores whitish, deli- 

 cately verruculose, 22-37 x 18-26 /x. 



Aecidium magelhaenicum (Berk.) grows on species of Berberis 

 in South America. The perennial mycelium distorts the buds 

 of the host and causes the formation of witches' brooms. 

 Aecidia usually scattered over entire under surface of leaf, 

 spores 20-40 x 16-24 /x ; epispore hyaline, verruculose, contents 

 orange. 



Aecidium esculentum (Barcl.) distorts and renders succulent 

 young shoots of Acacia ebumea, in India. Spores subcuboid, 

 28-40 x 16-19 ji. 



Aecidium ornamentale (Kalchbr.) sometimes occurs in 

 immense numbers on branches and spines of Acacia horrida, 

 at the Cape of Good Hope. The entire structure and general 

 appearance is completely altered by the fungus, the branches 



Y 





