Danish fungi as represented in the herbarium of ERostrup . Nibe!, Knudby!; F. Klingstrup; S. Frede-rikssund!. 74. Peronospora cytisi Rostrup (92 j &. p), Syn: Per. cytisi Mag-nus (Hedwigia 1892 ), Syll. XI ^ Per. trifoliorum de By. form,laburni vulgaris Voss in Thiim. Mycot. No. 2219, Guldregn-skimmel (R 02 a ^02 a R 04 a ^). At the same time as RostrupO. Kirchner (92) found it inWiirtemberg and P. Magnus inFrance (P. Mg. 93); about 10years before W. Voss found itin Laibach in Austria; Rostrupw^as, however, the first to deno-minate and describe it. It hasbeen found several times innurseries o

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Danish fungi as represented in the herbarium of ERostrup . Nibe!, Knudby!; F. Klingstrup; S. Frede-rikssund!. 74. Peronospora cytisi Rostrup (92 j &. p), Syn: Per. cytisi Mag-nus (Hedwigia 1892 ), Syll. XI ^ Per. trifoliorum de By. form, laburni vulgaris Voss in Thiim. Mycot. No. 2219, Guldregn-skimmel (R 02 a ^02 a R 04 a ^). At the same time as RostrupO. Kirchner (92) found it inWiirtemberg and P. Magnus inFrance (P. Mg. 93); about 10years before W. Voss found itin Laibach in Austria; Rostrupw^as, however, the first to deno-minate and describe it. It hasbeen found several times innurseries on about 10 speciesof cultivated Cytisus, particu-larly affecting the young plantswhich will quickly be killed byit (R 92]^). June-August. The colour of the clusters ofthe fungus is ash-grey on theunderside of the leaves, the cor-responding spots on the upper- ^S- ^? di 1, Leaf of Cytisus laburnum with Peronospora e are brown. d . -, j- u -^u a- cytisi Rostrup. 2, conidiophore with conidia. The conidiophores are regu- 3^ oospores. From R. 02 a. 5*. 68 larly 4—5 times furcated, at the end of each branch an elhptical, pale-brown conidie is laced off. The conidies measure 20—28 M X 15—20 , .In the cellular tissue are found numerous oospores 35—38 ?? in dia-meter, the wall is 7—8 M thick. Cytisus bhurnum. J, Viborg!; S. Roskilde (1888 J. Buch), Kebenhavn(O. R. a!). 75. Peronospora Candida Fuckel, Syll. VII ^ Fisch. IV^^ Syn:Per. oerteliana Kuhn. Syll. IX ^^ Kodriverskimmel (R 04 a ^). The mycelium is perennial in the subterrannean parts of the host-plant and affects all leaves of the diseased plants. May. Primula elatior. F. Hjallese (^^/s 97. Jak. Lge. see R 99 a 2) s. HaslevOrned! (Exs. Sydow). 76. Peronospora myosotidis de By., Syll. VII ^^ Fisch. IV, Forglemmigejskimmel (R04a^°), April—July, common on the leavesof Myosotis, f. inst. noticed from following places: IJthospermum arvense. S. Lundby (Jak. Lge). Myosotis arenaria. S. Bognaes.Myosotis versicolor. J. Viborg!,