Another _Sphæria_ in which the association is undoubted is the _Sphæria aquila_, Fr.,[M] which is almost always found nestling in a woolly brown subiculum, for the most part composed of barren brown jointed threads. These threads, however, produce, under favourable conditions, mostly before the perfection of the perithecia, minute subglobose conidia, and in this state constitute what formerly bore the name of _Sporotrichum fuscum_, Link., but now recognized as the conidia of _Sphæria aquila_. In _Sphæria nidulans_, Schw., a North American species, we have more than once found the dark brown subiculum bearing large triseptate conidia, having all the characters of the genus _Helminthosporium_. In _Sphæria pilosa_, P., Messrs. Berkeley and Broome have observed oblong conidia, rather irregular in outline, terminating the hairs of the perithecium.[N] The same authors have also figured the curious pentagonal conidia springing from flexuous threads accompanying _Sphæria felina_, Fckl.,[O] and also the threads resembling those of a _Cladotrichum_ with the angular conidia of _Sphæria cupulifera_, B. and Br.[P] A most remarkable example is also given by the Brothers Tulasne in _Pleospora polytricha_, in which the conidia-bearing threads not only surround, but grow upon the perithecia, and are crowned by fascicles of septate conidia.[Q] Instances of this kind have now become so numerous that only a few can be cited as examples of the rest. It is not at all improbable that the majority of what are now classed together as species under the genus of black moulds, _Helminthosporium_, will at some not very distant period be traced as the conidia of different species of ascomycetous fungi. The same fate may also await other allied genera, but until this association is established, they must keep the rank and position which has been assigned to them.