The _perithecia_ are always embedded in a _black stroma_, and are _not
distinctly separated_ from it. The accessory forms of reproduction are:
conidiophores, conidiocarps, and yeast-like conidia. The majority are
parasites. One order.
Order =Dothideaceæ=. _Phyllachora graminis_ produces scab-like
patches on the leaves of the Grasses.--_Scirrhia rimosa_ grows
on the leaf-sheathes of _Phragmites_.--_Rhopographus pteridis_
on _Pteridium aquilinum_.