392 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
independent tubes is diagrammatic in its simplicity and whether 
Schizophyllum is a progressive or a reduced type we have in it the 
evidence that gills in their essential nature are hymenium-bearing 
plates between independently originating endogenous gill cavities. 
To Professor R. A. Harper and Dr. M. Levine I wish to 
express my sincere appreciation of their kindly criticisms and 
helpful suggestions. 
LITERATURE 
Bary, A. de. Comparative morphology and biology of the fungi, 
mycetozoa and bacteria, 302. Oxford, 1887 
Buller, A. H. R. Researches on fungi, 113-119. London, 1909. 
Fayod, M. V. Prodrome d'une histoire naturelle des Agaricinées. 
Ann. Sci. Nat. Bot. VII. 9: 331-333. 1889. 
Fries, E. Observationes mycologicae, 103. 1815. 
Fries, E. Systema mycologicum, 1: 330. 1821. 
Hoffman, Н. Beiträge zur Entwickelungsgeschichte und Anatomie der 
Agaricinen. Bot. Zeit. 18: 389-397. 1860. 
Levine, M. The origin and development of the lamellae in Coprinus 
micaceus. Am. Jour. Bot. 1: 303-322. 1914 
Wakefield, E. M. Ueber die Bedingungen der Fruchtkórperbildung 
sowie das Auftreten fertiler und steriler Stamme bei Hymeno- 
myceten. Naturw. Zeitschr. Forst.-u. Landwirtsch. т биг 591. 
1909. 3 
Winter, С. Die Pilze Deutschlands, Oesterreichs und der Schweiz. In 
. Rabenhorst, L., Krypt.-Fl. 1: 493. 1884. 
EXPLANATION ОЕ -PLATE 9 
Fic. r. А carpophore thirty-four days old, grown from a "magis of deos ctm 
commune transferred from a branch of birch. 6/13 of the natural s 
Fics. 2and 3. Transverse vertical sections through three crenatures of a carpo- 
phore with gill cavities in different stages of development. Fig. 3 is further back 
from growing region than Fig. 2. The gill itcm are seen to lie nearer the ventral 
than dorsal surface. Photomicrograph X 2 
ransverse vertical section ы the growing region of а carpophore, 
showing only three crenatures as indicated by the two ventral furrows. The first 
crenature to the right shows undifferentiated tissues. In the middle crenature 
appears an imperfectly developed gill cavity and a closed hymenium primordium in 
which a gill cavity will appear. The crenature on the left shows two mature gill 
cavities. Photomicrograph X 43. 
ап46. Sections cut as above, slightly oblique through young carpophore 
in which gill cavities are open, showing three gills that have split along their lower 
