PODAXINEI.--These resemble in their localities the _Trichogastres_. Species of _Podaxon_ affect the nests of Termites in tropical countries.[D] Others are found growing amongst grass. TRICHOGASTRES.--These are chiefly terrestrial. The rare but curious _Batarrea phalloides_, P., has been found on sand-hills, and in hollow trees. _Tulostoma mammosum_, Fr., occurs on old stone walls, growing amongst moss. _Geaster striatus_, D. C., was at one time usually found on the sand of the Denes at Great Yarmouth. Although _Lycoperdon giganteum_, Batsch, occurs most frequently in pastures, or on hedge banks in fields, we have known it to occur annually for some consecutive years in a garden near London. The species of _Scleroderma_ seem to prefer a sandy soil. _Agloeocystis_ is rather an anomalous genus, occurring on the fruit heads of _Cyperus_, in India. _Broomeia_ occurs at the Cape on rotten wood. MYXOGASTRES.--Rotten wood is one of the most favoured of matrices on which these fungi develop themselves; some of them, however, are terrestrial. _Æthalium_ will grow on spent tan and other substances. Species of _Diderma_ flourish on mosses, jungermanniæ, grass, dead leaves, ferns, &c. _Angioridium sinuosum_, Grev., will run over growing plants of different kinds, and _Spumaria_, in like manner, encrusts living grasses. _Badhamia_ not only flourishes on dead wood, but one species is found on the fading leaves of coltsfoot which are still green. _Craterium_ runs over almost any substance which lies in its way. _Licea perreptans_ was found in a cucumber frame heated with spent hops. One or two _Myxogastres_ have been found on lead, or even on iron which had been recently heated. Sowerby found one on cinders, in one of the galleries of St. Paul's Cathedral. NIDULARIACEI grow on the ground, or on sticks, twigs, chips, and other vegetable substances, such as sawdust, dung, and rotten wood.