236 FUNGI. 



Agaricus gambosus, Fr., Marasmhis oreades, Fr., and some others 

 grow in rings. Hence it will be seen that, within certain limits, 

 there is considerable variation in the habitats of the Agaricini. 



Boleti do not differ much from Agaricini in their localization. 

 They seem to prefer woods or borders of woods to pastures, 

 seldom being found in the latter. One species, B. parasiticus, 

 Bull, grows on old specimens of Scleroderma, otherwise they are 

 for the most part terrestrial. 



Polypori also have no wide range of habitat, except in choice 

 of trees on which to grow, for the majority of them are corti- 

 colons. The section Mesopus, which has a distinct central stem, 

 has some species which prefer the ground. Polyporus tuberaster, 

 P., in Italy springs from the Pietra funghaia,* and is cultivated 

 for food as well as Polyporus avellanus, which is reared from 

 charred blocks of cob-nut trees. 



In other genera of the Polyporei similar habitats prevail. 

 Merulius lacrymans, Fr., one form of dry rot, occurs in cellars, 

 and too often on worked timber ; whilst Merulius himantoides, 

 Fr., is much more delicate, sometimes running over plants in 

 conservatories. 



HTDNEI. There is nothing calling for special note on the 

 habitats of these fungi. The stipitate species of Hydnum are 

 some of them found in woods, others on heaths, one on fir-cones, 

 while the rest have similar habitats to the species of Polyporus. 



AURICULARINI. The genera Hymenochcete^ Stereum, and Cor- 

 ticittm, with some species of Thelephora, run over corticated or 

 decorticated wood; other species of ThelepJiora grow on the 

 ground. The Pezizoid forms of Cypliella and Solenia, like species 

 of Peziza, sometimes occur on bark, and of the former genus 

 some on grasses and others on moss. 



CLAVATJIEI. The interesting, often brightly-coloured, tufts of 

 Clavarla are usually found amongst grass, growing directly from 

 the gronnd. Only in rare instances do they occur on dead leaves 

 or herbaceous stems. Calocera probably should be classed with 

 the Tremellini, to which its structure seems more closely allied. 

 The species are developed on wood. The species of TypJiula 



* Badham's "Esculent Funguses," Ed. i. pp. 42, 116. 



