The verdigris-green colour of the top of this mushroom is not permanent, but consists of green slime that soon gets washed off by the rain, flaked with white scales. The stem is hollow, and the top fleshy. It generally grows about stumps, is a very handsome fungus, and is doubtless poisonous. =Fiery Tube-Mushroom.= Fig. 26. (_Boletus piperatus._) 597. Never attains a larger size than the specimen on the sheet; indeed it is one of the smallest of all the _Boleti_. The taste is highly acrid; it is therefore looked upon with grave suspicion, and it is probably a very dangerous plant. It grows in woods, but is rare. =Satanical Tube-Mushroom.= Fig. 27. (_Boletus Satanas._) 606. The specimen figured I gathered in Crab-tree Wood, near Winchester, during an architectural excursion to St. Cross. I have only once seen anything of it elsewhere, though my late friend Mrs. Gulson, of Eastcliff, has sent it on to me several times from the neighbourhood of Teignmouth. Without doubt it is by far the most splendid of all the _Boleti_. The top is nearly white, very fleshy, and a little viscid; the stem is firm, exquisitely coloured, and beautifully reticulated; the under surface is brilliant crimson. It usually attains a large size, grows in woods, and as soon as broken or bruised, changes to blue. In all likelihood it is highly poisonous. =Pungent Milk-Mushroom.= Fig. 28. (_Lactarius acris._) 505. As its name indicates, this is a very acrid and dangerous fungus. It is said to be rare, but I have sometimes known it to be extremely abundant in the woods near London. When cut or broken, the flesh and white milk change to a dull-sienna red; this distinguishes it from all other mushrooms. To observe the change of colour it requires at times a little patience; for I have known half an hour, or even an hour, elapse before the change of colour is manifest. =Bitter Tube-Mushroom.= Fig. 29. (_Boletus felleus._) 617. Said to be rare, but generally abundant in Epping Forest. I have found it in abundance in Nottinghamshire, and know it well; it was the first Boletus I ever drew, and I was then nearly eating it for _Boletus edulis_. The bitter taste of _B. felleus_, the _flesh-coloured tubes_, the flesh-colour of the top when broken, the reticulated stem, and the pink spores are the distinguishing marks of this species. It is poisonous. =False Champignon.= Fig. 30. (_Marasmius urens._) 550. The more slender habit, the mealy stem, white downy base, and the narrower, darker, and crowded gills, distinguish this counterfeit from the true champignon (fig. 28, Edible Sheet). It sometimes accompanies the latter plant, but with ordinary care can be detected in a moment. It grows in _woods_, as well as in pastures and by roadsides.