26 THE AGARICACEAE OF MICHIGAN 



AN OUTLINE OP THE FUNGI 



I. Mycelium lacking. Bacteria. 



Mycetozoa. 

 Chytrids. 



I. Mycelium forming the vegetative part of the plant. II. 



II. Mycelium non-septate, (i. e., without cross-walls). 



Phycomycetes. 



II. Mycelium septate, (i. e., composed of many cells). III. 



III. Spores not borne on a differentiated hymenium, not in asci 



nor on basidia. Fungi Imperfecta 



III. Spores usually borne on a differentiated hymenium. IV. 



IV. Spores borne in asci, usually eight in an ascus. 



Ascomycetes, 



IV. Spores borne on basidia, usually four on a basidium . 



Basidiomycetes. 



The Basidiomycetes 



(1) Basidia not forming a hymenium; spores borne on a four- 

 celled basidium arising from resting-spores ; parasites. 



Smuts and Rusts. 



(1) Basidia arranged so as to form a hymenium (2) 



(2) Hymenium not in a special fruit-body but developed directly 



from the vegetative hyphae in the host. Exobasidii. 



(2) Hymenium on or within a special fruit-body I '■'< i 



(3) Hymenium concealed within the fruit-body till spores are ma- 



ture. (See 10th Rep. Mich. Acad, of Sci., p. 63.) 



Gasteromyeetes. 



(3) Hymenium exposed ( Hymenomycetes.) 1 4 ) 



(4) Basidia forked or divided into four cells; plants usually gela- 



tinous, horny when dry. Tremellales. 



(4) Basidia clavate or subcylindrical. Agaricales* 



Key to the Families of Agaricales 



1 1 ) Hymenophore* not differentiated ; basidia scattered on a loose 

 . subiculum of hyphae. Hypochnaceae. 



(1) Hymenophore even, not forming special branches, tubes, gills, 

 etc. Thelephoraceae. 



(1) Hymenophore in the form of wrinkles, warts, spines or tooth- 

 like plates, usually on the under side of fruit-body. 



Hydnaceac. 



*The term "hymenophore" is here used to designate that part of the fruit-body which bears 

 the hymenium, e. g., gills, tubes, spines, etc. 



