FUSOMA. 505 



after in moist weather or umlcr artificial cultivation, a 

 light-grey mycelium appears bearing numerous 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 Hover, (^n living leaves of Tara.mevm officinale. 



Septocylindrium. 



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

 more septa, and produced in chains. 



Septocylindrium aromaticum 8acc. occurs on living Acorus 

 C(iJa)ni/.s, killing heaves 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. Skct. Amkik.sporae. 



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. Suhsei't. Macronemeae. 



Hormodendron. 



^Mycelium grey, epiphytic, and creeping. Conidiophores erect, 

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

 and ]ir(i(lurO(l in cliains. 



Hormodendron hordei I'.r.^ 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 

 Hordcnm mvrinum on the margins of roads and fields. 



' Brulme in Zopf's lieitrage z. Physio/, it. MorphoK nitd. Ornanixmoi, iv., 

 1894. 



