283 



Pinus strobus common. Pinus excelsa (hosp. nov.). L. Fuglsang Have (R 

 02 a '■'^). Ribes aureum. J. Fredrikshavn (V. S.); F. Skaarup; S. Holte (R 06 m), 

 Lyngby (K. H.), Slagelse; Meen Stengaard. Ribes Biebersteinii. S. Forsthaven 

 ved Charlottenlund. Ribes divaricatum. S. Landbohejskolens Have. Ribes gra- 

 cile (R 95 a ^"5). Ribes giossularia (R 06 r). S. Vindered Skov, Forsthaven etc. 

 Ribes multiflovum (R 95 a ^'^^). Ribes nigrum common (specimens from F. 

 Holmdrup 1874 in Thiim. Myc. no 146). Ribes nigrum variegatum. S. Landbo- 

 hejskolens Have. Ribes nigrum laciniatum. S. Forsthaven. Ribes petraeum. S. 

 Forsthaven. Ribes rubrum. J. Mariager, Langaa!, Linaa Vesterskov; F. Braende- 

 skov, Raagebjaerg, Klingstrup, Trolleborg (Joh. Lge); S. Landbohojskolens 

 Have, Hyldeholt; L. Stensgaard; Meen Hunese; B. Remersdal (Neger 06). 

 Ribes sanguineum. J. Viborg ! ; Falst. Stubbekebing (R 05 b ''"). 



Coleosporium. 



Coleosporium forms a most homogeneous genus; st. I is always a 

 Peridermium on the leaves of Pinus "Peridermium acicola" = Aeci- 

 dium pini Pars. Syn. "^■, st. II &. Ill are both microscopically and 

 macroscopically very homogeneous as to all species; accordingly the 

 limitation of the separate species is rather a matter of judgment. Fries 

 (S. V. ^^^) classified the species according to the different families of 

 phanerogams housing teleutospores (Coleosp. synantherarum, cam- 

 panulacearum etc.); modern authors classify them according to bio- 

 logical circumstances; but they are not always quite constant. 



In May 1889 Rostrup noticed near Arresedal a severe attack of 

 Peridermium acicola on Pinus montana and silvestris, evidently origi- 

 nating from St. Ill on wintered leaves of Campanula rapunculoides. 



Also from other sides it has been confirmed later on that the teleuto- 

 spores germinate directly after the finishing of their formation, and 

 the sporidii infect the young leaves; the mycelium winters in these 

 and develops st. I in spring. 



Several of the species — probably all of them — may, however, 

 propagate only by uredo spores all the year round (R 84 a *). Rostrup 

 84 a ''" 6^ 96 o ^'^') once observed a curious mutation of a Coleospo- 

 rium, finding that a Crepis tectorum which was surrounded by Sene- 

 cio vulgaris, highly infected by Coleosporium senecionis, had a few 

 sori of Coleosporium on its leaves. 



Both Rostrup and P. Nielsen have made several infection experi- 

 ments with Peridermium acicola and Coleosporium, but they have 

 not published much about them (R 77 b "«, 89 a, 94 f). After Wolff's 

 statement in 1872 of the relation between Peridermium acicola and 

 Coleosporium senecionis, many mycologists — and among those also 

 Rostrup — considered it a fact that all forms of Peridermium — both 

 "acicola" &. "corticicola" — belonged to Coleosporium senecionis, 

 which Rostrup expressed in several places in his publications during 



