AECIDIUM-FORMS. 409 



Aecidium pseudocolumnare Kiihn.^ Occurs on needles of 

 Abies pectinata in Germany ; in Britain, however, on this and 

 several other species of Abies. It is distinguished by its large 

 white spores from the Ace. columnare of Calyptospora (p. 372). 



Aec. Magelhaenicum Berk. This species occurs on various 

 species of barberry. The mycelium hibernates in the shoot- 

 buds and causes them to develop as witches' brooms, bearing 

 on the lower surface of their leaves aecidia with long, white, 

 sac-like peridia. The allied teleutospore-form is as yet unknown. 



Aec. dematidis D. C. (Britain and U.S. America). On Clematis Vitalha, 

 C. recta, and other species. It is related to Piiccinia agropyri Ell. et Ev.^ 



Aec. Englerianum Heun. et Lind.^ produces a peculiar antler-like 

 branching of the twigs and leaves of a Clematis at Eritrea (Lytri) in the 

 Orecian Archipelago. 



Aec. pimctatum Pers. (Aec. qiiadrifidwm B.C.) (Britain and U.S. America). 

 This is a common species on Anemone (Fig. 190) and Eranthis. The 

 aecidia have white peridia, which on dehiscence break into four lobes. 



Aec. leucospernium D. C. (Britain and U.S. America). On Anemone 

 nemorosa (Fig. 190). 



Aec. hepaticae Beck. On Anemone Hepatica. 



Aec. ranunculacearum D. C. (Britain and U.S. !S:merica). On species 

 of lianunculus. A collective name for aecidia of several species of Uromyces 

 (p. 336), and Puccinia (p. 349). 



Aec. aquilegiae Pers. (Britain and U.S. America). On Aquilegia 

 vulgaris and other species. (See Puccinia agrostidis, p. 349.) 



Aec. actaeae (Opiz.). On leaves of Actaea spicata in Europe and America. 



Aec. barbareae D. C. On species of Barbarea (Britain). (See Pitoc. 

 festucae, p. 349.) 



Aec. circaeae Ces. On species of Circaea. 



Aec. grossulariae Schum. (Britain and U.S. America). On Rihes Orossu- 

 laria and R. ruhrum. Klebahn believes it is related to a Puccinia on Carex. 



Aec. bunii D. C. On Conopodium denudatum in Britain. (See Puce, 

 bistortae, p. 355.) 



Aec. periclymeni Schum. On species of Lmiicera. (Britain.) (See Pw.c. 

 festucae, p. 349.) 



Aec. compositarum. A provisional species-name for a large number of 

 aecidia frequenting Compositae, and by no means resembling each other. 



Aec. leucanthemi D. C. A European species with its Pjecczreia- form on 

 Carex montana. 



Aec. cyani D. C. On Centatirea Cyanus. 



Aec. ligustri Strauss. On Privet. 



' Hedwigia, 1884. 



^Dietel, Oesterreich hotan. Zeitung, 1892. 



■'Engler's Botan. Jahrbuch, 1893. 



