38 , JOURNAL OF THE 



angles will be a scar left by the abscised conidium. If the 

 onward growth of the conidiophore is not divergent, but 

 follows its primary direction, then a shoulder will fre- 

 quently appear where the conidium was abscised, or the 

 new growth may occur so soon as to turn the apex with its 

 scar to one side, when the conidiophore will be nearly 

 cylindrical with scars distributed along its sides. In some 

 cases like the latter the production of conidia is very rapid 

 also, so that no sooner has the conidiophore begun to grow 

 past the conidium than it bears another conidium, and thus 

 two or more scars may be left very near each other on a 

 cylindrical conidiophore. If several conidia are thus borne 

 very near one place the conidiophore is apt to be somewhat 

 enlarged at this point, especially if it is characteristic for 

 the species that the scar is left on a minute protuberance. 

 A case of this kind has come under my notice in C. papu- 

 losa Atkinson. When the growth of the conidiophore 

 beyond its fruiting apex is not very rapid and at the same 

 time in a direction divergent from its primary direction it 

 will appear denticulate or jagged. 



The conidiophores are farther marked by vaatoles or 

 giittulce in some cases, as well as by the possession of some 

 coloring substance, brown, reddish, olive, fuliginous, etc. 



The conidia are usually elongated and filamentous, hya- 

 line or colored, usually septate, cylindrical, terete, obcla- 

 vate, or tereti-fusoid. In their early development from the 

 apex of the conidiophore they are marked off from the 

 latter by a strong constriction, the union between the two 

 being quite frail. If it does not meet with any mishap it 

 continues to grow b}' elongation, receiving its nutrition 

 through the small point of contact with the conidiophore. 

 At first it appears as a small oval or elliptical or clavatc 

 body, which as it grows elongates, loses it clavate form, 

 and assumes one of the forms described above. The great 

 variation in length of the conidia of the same species is influ- 



