TRICHOSPORES might be applied better, perhaps, than _conidia_ to the spores which are produced on the threads of the _Hyphomycetes_. Some of them are known to be the conidia of higher plants; but as this is by no means the case with all, it would be assuming too much to give the name of conidia to the whole. By whatever name they may be called, the spores of the _Hyphomycetes_ are of quite a different type from any yet mentioned, approximating, perhaps, most closely to the basidiospores of the _Hymenomycetes_ in some, and _Gasteromycetes_ in others; as, for instance, in the _Sepedoniei_ and the _Trichodermacei_. The form of the spores and their size differ materially, as well as the manner in which they are produced on the threads. In many they are very minute and profuse, but larger and less plentiful in the _Dematiei_ than in the _Mucedines_. The spores of some species of _Helminthosporium_ are large and multiseptate, calling to mind the spores of the _Melanconiei_. Others are very curious, being stellate in _Triposporium_, circinate in _Helicoma_ and _Helicocoryne_, angular in _Gonatosporium_, and ciliate in _Menispora ciliata_. Some are produced singly and some in chains, and in some the threads are nearly obsolete. In _Peronospora_, it has been demonstrated that certain species produce minute zoospores from the so-called spores. The dissemination of the minute spores of the _Mucedines_ through the air is undoubted; rain also certainly assists not only in the dispersion of the spores in this as in other groups, but also in the production of zoospores which require moisture for that purpose. The form of the threads, and the mode of attachment of the spores, is far more variable amongst the _Mucedines_ than the form of the spores, but the latter are in all instances so slightly attached to their supports as to be dissevered by the least motion. This aids also in the diffusion of the spores through the atmosphere. [Illustration: FIG. 63.--Spores of _Helicocoryne_.]