18 



mycologicae, sistens fungos in peregrinis terris a botanicis Danicis 

 nuper collectos. Upsala 1851). About 1860, when he had been ap« 

 pointed professor of botany, he occupied himself very much with the 

 parasitic fungi, mostly with such of these as are found on the corn 

 or on other cultivated plants. When "Selecta fungorum carpologia" 

 by TuLASNE Brothers, had been published in Paris in 1861, 0rsted 

 tried to follow in their footsteps by endeavouring to find the genetic 

 relation between the ascospore stage of the Pyrenomycetes and 



their conidial stage among the socalled fungi 

 imperfecti. He particulary studied a series of 

 fungi on fallen cones of Coniferae and heres 

 by made the important discovery that Phelo* 

 nitis strobilina, which had hitherto been cons 

 sidered as belonging to Myxomycetes, was 

 a Caeoma, and accordingly must be referred 

 to Uredinales (0rsted 63 a &. b). His obser? 

 vations of the fungus which he called Pleoss 

 poropsis strobilorum, which, according to 

 the description and figure must be considered 

 Rosellinia obliquata (Fries) Wt. and which 

 he considered as genetically related to four 

 different "fungi imperfecti", has never been 

 re-examined by others, and the proofs stated 

 by him are not convincing. Much more for* 

 tunate was 0rsted when, in 1865 he commenced making cultural 

 experiments, with the species of Gymnosporangium on branches of 

 Juniperus, infecting leaves of Pirus, Sorbus and Crataegus and thus 

 finding the heteroecism of Gymnosporangium sabinae, juniperi and 

 clavariiforme at the same time and independently of de Bary's diss 

 covery of the heteroecism of Puccinia graminis, dispersa and coronata. 

 More of 0rsted's books treat chiefly the diseases of cultivated plants 

 and their control (0rsted 62, 63 c, 63 d, 65 c, 66 b) ; we must therefore 

 consider him the closest predecessor of Rostrup, both as a mycologist, 

 and as a phytospathologist. (Concerning 0rsted see R Brown: Biogra= 

 phical sketch of the late Professor 0rsted. Transact, of the Bot. Soc. of 

 Edinburgh vol. XI 1872). 



Concerning the Danish mycologists before Rostrup further biografis 

 cal information may be obtained from Worm: Lexicon over la;rde 

 Maend, N. M. Pedersen: Bidrag til den danske Litteraturs Historic, 

 Nyerup & Kraft: Forfatterlexicon, Erslev: do., Eug. Warming: Den 

 danske botaniske Litteratur, Bot. Tids. vol. XII and Bay: Tilljeg til 

 samme vol. XVII, Bricka: Biografisk Lexicon etc. 



A. S. 0RSTED. 

 From a photo. 



