162 



By experiments in his laboratory W.Johannsen has proved thatHor- 

 deum which obtained ample nitrogenous nourishment was severely 

 affected while Hordeum which obtained no nitrogenous nourishment 

 was not affected by this fungus (see R 85 h '^'^). 



Dactylis glomerata, Bromus secalinus, commutatus, racemosus, mollis, ramo- 

 sus, Festuca arundinacea, Poa annua, trivialis, pratensis, Avena sativa, Milium 

 effusum, Agrostis spica venti, Brachypodium silvaticum, Cynosurus cristafus, 

 Anthoxanthum odoratum, Hordeum sativum, Triticum repens &. sativum (R 80 d), 

 Secale cereale, Lolium multiflorum &. temulentiim. 



604. Erysiphe communis Fries S. M. Ill ^'^ Syll. I '\ Syn: Er. pisi 

 de Cand, Er. Martii Lev., Syll. I ^^ Er. umbeUiferarum (Lev.) de By., 

 Syll. I ", Er. polygoni Fries S. M. Ill ^"^ Almindelig Meldug, TErte- 

 blomsternes Meldug 6. Skjermplanternes Meldug (R 02 a '^\ R 04 a ^5'). 



Common. Noticed on Uttica dioeca, Rumex acetosella. Polygonum aviculare, 

 Alyssum calycinum (conidia only), Capsella bursa pastoris (conidia), Brassica 

 campestiis &. napus (conidia), Hypericum hirsuhim, perforatiim, quadrangulum, 

 Geranium pusillum, dissectum, molle, palustre, Lathyrus pratensis, Pisum sati- 

 vum (see Dybdalil 77 ^^2), Vicia cassubica, Onobrychis sativa, Lathyrus praten- 

 sis, Melilotus officinalis, Trifolium procumbens, minus, hybridum, arvense, incar- 

 natum, praiense, medium, Lupinus angustifolius 6^ luteus, Medicago falcata &. 

 sativa (M. L. M. 07), Ononis spinosa, Cytisus laburnum, Lythrum salicaria, 

 Circaea lutetiana, Caliha palustris, Clematis Jackmanni, Aquilegia spp., Aconitum 

 napellus. Delphinium ajacis &. elatior. Ranunculus lingua, flammula, acer, repens, 

 sardous, Actaea spicata, Thalictrum minus G^ flavus, Anthriscus Silvester, Pim- 

 pinella saxifraga, Angelica silvestris, Pastinaca sativa, Heracleum sphondylium, 

 Torilis anthriscus. Campanula rapunculoides, Valerianella olitoria &. Morisonii, 

 Scabiosa columbaria, Succisa praemorsa, Knautia arvensis, Cirsium arvense. J. 

 Viborg (! Exs. Vgr. no 913). 



605. Erysiphe tortilis Fries S. M. Ill =^^ Syll. I ", Kornel Meldug 

 (R02a''=«&04a^59-) 



On the leaves and fruits of Comus sanguinea quite common (R 80 a''''^) 

 f. inst. F. Skaarup (Sept. 76); S. Alindelille (R 97 n); B. Hammeren (Neger06). 



606. Erysiphe labiatarum Fries S. M. IIP''^ Syn: Er. galeopsidis 

 de CandoIIe, Syll. I ''*, Salmon 00, Oidium lamii Rabenh., Laebeblom- 

 sternes Meldug (R 04 a ^^'). 



Noticed on Ballota nigra &. ruderalis, Stachys paluster, silvaticus X paluster, 

 silvaticus, Leonurus cardiaca, Galeopsis tetrahit &. speciosa, Lamium galeobdolon, 

 album, purpureum, amplexicaule X purpureum, amplexicaule, Ajuga pyramidalis 

 (Oidium only), Origanum vulgare (Oidium). 



607. Erysiphe cichoriacearum Fries S. M. Ill ^*\ Salm. 00 ^'^ R 

 02a■''^ Syn: Er. lamprocarpa (Wallr.) Lev., Syll. r^ Er. Linkii Lev., 

 Syll. I '\ Er. horridula (Wallr.) Lev., Syll. I «, Oidium chrysanthemi 

 Rabh., Syll. IV''^ LdauVIII", Oidium myosotidis Rabh., Oidium ery- 



