FUSOMA. 505 



after in moist weather or under artificial cultivation, a 

 light-grey mycelium appears bearing mimerous slightly curved, 

 tapering, pluriseptate conidia (Fig. 311). In Bavaria and 

 Baden this parasite has caused great loss in the seed-beds of 

 conifers. 



F. inaequale Hoyer. On living leaves of Tarccxaaim officinale. 



Septocylindrium. 



Conidia cylindrical, hyaline or pale-coloured, with two or 

 more septa, and produced in chains. 



Septocylindrium aromaticum Sacc. occurs on living Acm'us 

 Calamus, killing leaves and even plants. The mycelium grows 

 intercellularly and produces spots. The conidiophores emerge 

 in tufts from stomata included in the spots, and give off long 

 thread-like, pluriseptate, hyaline conidia. 



2. FAM. DEMATIEAE. 



1. Sect. Amerospoeae. 



1. Suhsect. Micronemeae. 



Many of the genera of this subsection contain species found 

 on the living leaves of plants, but none of them are yet of 

 economic importance. 



2. Suhsect. Macronemeae. 



Hormodendron. 



Mycelium grey, epiphytic, and creeping. Conidiophores erect, 

 branched, and septate. Conidia spherical or ovoid, unicellular, 

 and produced in chains. 



Hormodendron hordei Br.^ This produces a characteristic 

 spotting of the haulms and leaves of barley, accompanied by a 

 stunting of the whole plant and poor development of the ears. 

 This is not a true parasite, but when it appears in quantity 

 it has considerable effect, attacking whole fields and causing 

 great injury. The spots and conidia are found also on wild 

 Mordeum murinum on the margins of roads and fields. 



^ Bruhne in Zopf 's Beitrage s. Physiol, u. Morphol. nied. Organismen, i v. , 

 1894. 



