179 



morhiza Dicks, (see R 93 b °). Shortly after the discovery by Tulasne 

 of the relation of Claviceps to Sclerotium clavus Rostrup confirmed 

 his observations by numerous cultivating experiments (see R 66^^^). 

 Several recent mycologists are studying its biology. By this it has 

 been proved that this name comprises many biologically different 

 species (see Stager 03 &. 05). 



The sclerotia of Secale cereale is a most valuable drug and is sold 

 under the name of "Secale cornutum". It is very common and the 

 sclerotia are found in the heads of most of the Danish species of 

 Gramineae; it is, however, not equally common in all. 



Dactylis glomerata, Bromus Benekeni, serotinus, erectus, secalinus, vestitus, 

 Festiica ovina &. var. duriuscula, rubra, distans, arundinacea (see R 81 a^''), pra- 

 tensis, gigantea, Holcus mollis &. lanatiis, Avena pratensis & elatior, Trisetam 

 flavescens, Melica altissima, Milium effusum (see Stager 05), Brachypodium sib 

 vaticum, Phalaris arundinacea, Anthoxanthum odoratum, Hordeum sativum, 

 europaeum, murinum, arenarium, nudum, Triticum sativum, m.onococcum, jun- 

 ceum X repens, repens, caninum, Secale cereale, Lolium perenne, multiflorum, 

 remotiim, temulentiim. 



695. Claviceps microcephala (Wallr.) Tulasne, Syll. II ^«^ Wt. 

 II '", R 02 a '■'>'. 



The distinction between this species and the abovementioned one 

 is very difficult and must first be proved by means of cultural experi- 

 ments of which not many have hitherto been made (see especially 

 Stager 03). Rostrup states that Calamagrostis arenaria X epigejos which 

 on account of its hybrid nature does not produce seeds will do so 

 when attacked by this fungus (05 b ^^^). 



Poa pratensis &. palustiris (see R 99 c 1^^), Arundo phragmiies (see R 97 m ■") 

 Molinia coerulea, Aira flexuosa, Calamagrostis arundinacea, epigejos, arenaria X 

 epigejos, arenaria, Agrosiis alba, Alopecurus agrestis, geniculatiis, pratensis, 

 Phleum pratense, Nardus strictus. 



696. Claviceps Willsonii Cke., Syll. IX s^'. Lit: R662" 

 Very common in the heads of Glyceria fluitans &. plicata. 



Dothideales. 



Most species of Dothideales attack the living part of the host in 

 summer, but the ripe asci and spores do not occur on the dead 

 plants until the following spring. A number of the species produce 

 lower forms of fructification of almost the same outer appearance as 

 the ascigerous stage; and the greater part of them belong to the 

 connected formgenera Dothiorella, Rabenhorstia and Placosphaeria. 



12* 



