42 



dioecae on Carex dioeca was always found. In "Store Vildmose", 

 near Ny Vraa and S. Elkjaer they found a hitherto unknown Aecidium 

 on Cineraria palustris and next to it was found Puccinia eriophori 

 Thumen which then was known only in Siberia. Also on their 

 return to Skaarup when they found aecidia which Rostrup had only 

 found in a few growing places they several times tried to find di* 

 rections as to their probable alternating host-plant by looking for 

 decayed rusty leaves; in this manner the relation between Aecidium 

 glaucis and Uromyces maritimae as also between Aecidium sonchi and 

 Puccinia littoratis were found, and Rostrup has expressly put down 

 in his diary that it was most frequently "sharp-eyed Johanson" who 

 discovered the decaying rusty leaves. All those four combinations 

 have later on proved correct. 



Johanson and Rostrup continued to carry on a frequent corres* 

 pondence, and no doubt Johanson should have repeated his visit 

 to Rostrup if his promising mycological studies had not in a sad 

 way been interrupted by his being drowned in the river "Fyrisaa" 

 June 26. 1888 not fully 30 years of age while attempting to rescue a 

 boy who had fallen into the water. The fungi collected in Denmark 

 by Johanson are contained in the Botanic Museum of Upsala; more 

 species had been collected in so great a number that they have later 

 on been able to be published in Vestergren's exciccati. (Biography of 

 C. J. Johanson see Bot. Notiser 1888 p. 190). 



THE PLAN OF THE WORK. 



THE MATERIAL of the present list pf Danish fungi is not only the 

 posthuman fungi herbarium of Rostrup; it consists of all the collecs 

 tion left by Rostrup and now revised by me viz. both Rostrup's 

 collection of Danish fungi which was, after his death, bought by the 

 Danish Government and which is now contained in the Botanical 

 Museum of the University of Copenhagen; as also all fungi which 

 Rostrup has, in the course of time, collected and presented to the 

 Botanical Museum, or those collected by others and determined by 

 Rostrup; also the fungi distributed by him through the exsiccati to 

 which he has contributed, and the fungi which he has included in 

 the phytopathological collection of the Vet» 6. Agricul. College. I have 

 also studied his written mycological diaries and all the numerous pa< 

 pers (more than 500), small and large which he published. I have also 

 added some fungi I have myself found during the later years and 



