Leucosporae 



fostering lodgment in many trees when in decay, it is more than prob- Pieurotus. 

 able that the several species can be propagated by planting their spores 

 upon such decaying woods, or by transplanting the mycelium. 



Growths of P. ostreatus, P. sapidus, P. salignus, and probably other 

 species of Pieurotus, can be forced, by watering the spots upon which 

 they are known to grow. Dr. Kalchbrenner mentions that the P. 

 sapidus is in this way cultivated in Hungary. Acting upon this men- 

 tion the writer had good success with P. ostreatus. Experiments in 

 this direction are likely to be interesting and rewarding. 



No species is suspected of being noxious. 



An analysis of P. ostreatus is given by Lafayette B. Mendel, Shef- 

 field Laboratory of Physiological Chemistry, Yale University, as follows : 



Water 73-7% 



Total solids 26.30 



The dry substance contained: 



Total nitrogen 2.40 



Extractive nitrogen 1.27 



Protein nitrogen 1.13 



Ether extract 1.6 



Crude fiber 7.5 



Ash 6.1 



Material soluble in 85$, alcohol 31.5 



American Journal of Physiology, Vol. I, No. n, March I, 1898. 



I. EXCEN'TRICI . 

 * Veil fugacious, etc. 



P. dry'inus Pers. Gr. oak. PileilS 2 in. broad, whitish, variegated 

 with spot-like scales which become dingy-brown, lateral, oblique, rather 

 plane. Flesh thick. Stem very curt and obese, commonly i in. long^ 

 and thick, somewhat lateral, somewhat woody, squamulose, white, with 

 a short, blunt root. Veil scarcely conspicuous on the stem, but 

 appendiculate round the margin of the pileus when young. Gills not 

 very decurrent, somewhat simple, not anastomosing behind, narrow, 

 white, becoming yellow when old. 



On trunks, oak, ash, willow, etc. Stevenson. 



Spores iox4ft Massee. 



Edible. Cordier, Cooke. 



When young the caps are tender; of the consistency, when cooked, of 



137 



