482 SUMMARY OF CURRENT RESEARCHES RELATING TO 



normal in colour, shape, and size. From these spores numerous fruiting 

 bodies have arisen showing such striking variations in form from the 

 original parent, that the author has thought it best to discuss this phase 

 in a future paper. Cultures were found to fruit in either light or 

 darkness, although the first stages were always initiated in the dark. 

 All cultures from the same fruit body made on one particular lot of 

 medium, which had been slightly scorched in preparation, either fruited 

 or produced abortive fruit bodies, while no fruiting was observed in 

 other cultures. Young points out that this condition would give rise 

 to substances not generally present in the culture medium, and suggests 

 that this condition of nutrition may have been the determining factor.- 

 Cultures of Armilla/ria mellea were also prepared. Rhizomorphs soon 

 appeared in the culture ; but, whereas these in nature are shining black 

 strands, " here, however, they are of a shining light-grey colour, and 

 are flat and ribbon-like, often branching dichotomously." Upon pene- 

 trating to a free surface these rhizomorphs immediately give rise to the 

 ordinary vegetative mycelium. 



Variations in Tricholoma nudum.* — L. Matruchot has investigated 

 the influence of the environment on the variability of Tricholoma nudum. 

 Previously the author in collaboration with Constantin had worked out 

 the conditions of culture of this species. The present paper records the 

 first series of investigations conducted with a mycelium which has been 

 cultivated for twelve years in oak leaves. By choosing the young 

 mycelium the fungus can be propagated indefinitely, and when cultivated 

 in caves fructifies the whole year round — an important practical point 

 as the fungus is a well-known edible species. The fungus cultivated in 

 the subterranean caves in a normally hygrometric atmosphere at a 

 constant temperature of 11° C. grows as vigorously as in natural 

 conditions. It however loses certain of its characters, particularly its 

 violet pigment which is a characteristic of the species nudum, and the 

 sinuosity of the gills which is a characteristic of the genus Tricholoma. 

 These changes are observed in all individuals without exception. In 

 spite of these profound modifications in the form and colour of the 

 fungus, the hymenium, the basidium, and the spore retain their normal 

 characters of form, structure, and dimensions. The delicate taste and 

 the smell of anise remain. 



Conidium Production in Penicillium.f — C. Thorn gives a series of 

 notes on certain morphological features " common to the species, which 

 for convenience are lumped together under the generic name Pmicillium" 

 The conidiopores, conidial apparatus, conidium formation, connective, 

 melutaj, and the shape and measurements of conidia, are commented on. 



Fungi from Northern Palawan.} — H. and P. Sydow give a further 

 list of fungi collected by Merrill in the Island of Palawan. The region 

 is exceedingly rich in Pyrenomycetes and poor in Uredinere, Ustilaginese, 



* Rev. Gen. Bot., xxv.bis (1914) pp. 503-9 (1 pi.). 



t Mycologia, vi. (1914) pp. 211-15. 



X Philippine Journ. Sci., ix. (1914) pp. 157-89. 



