DEPARTMENT REPORTS. 



95 



MYXOMYCETES. 



(SLIME MOULDS.) 



The following list of myxomycetes includes a number of specimens 

 received from Mr. H.C. Beardsleeof Cleveland, Ohio, collected near Lewiston, 

 Mich. These specimens are indicated by * 



Arcyria cinera Bull. 



* " digitata Bull. 



* " punicea Pers. 

 *Calonema aureura Morg. 

 Chondrioderma floriforrne Bull. 



•' globosum Pers. 



*Coruatricha crypta Schw. 



typhina Roth. 

 *Craterium aureum Schw. 



leucocephalum Ditm. 

 *Cribraria argillacea Pers. 

 Dictydium cernuum Pers. 

 *Didernia effusum Schw. 



" reticulatum Rost. 

 " stromaturn Link. 

 ' ' testaceum Schrad 

 *Didymium farinaceum Schrad. 

 Fuligo varians Somm. 

 *Hemiarcyria ablata Morg. 

 " clavata Pers. 



Hemiarcyria rubiformis Pers. 



" serpula Scop. 



Lycogala epidendrum Buxb. 

 *01igonema pusilla Schrad. 

 *Ophiotheca Wrightii B. & C. 

 *Pericbaenia irregularis B. & C. 

 Pbysarum cinerum Batsch. 



" leucopheeurn Fr. 



" polycepbalum Schw. 



*Reticularia lycoperdon Bull. 

 Stemonitis ferruginea Ehr. 



" fusca Roth. 



" rnaxima Schw. 



•' microcarpa Lister. 



" splendens Rost. 



Tilniacioche gyrocepbala (Mont.) Rost. 

 l richia affiuis De By. 



* " chrysosperma Bull. 



* " scabra Rost. 



* " varia Pers. 



Pertaining to the subject, I include here the following paper read at 

 Ann Arbor in March last, at a meeting of the State Academy of Science: 



THE MORELS— MORCHELL A. 



BY B. O. LONGYEAR. 



The morels constitute a small but distinct genus of saprophytic fungi, 

 belonging to the family discomycetes. They are easily distinguished from 

 closely related fungi by having the pileus covered with branching and 

 anastomosing ridges, which form pits or depressions of varying shapes. 

 The hymeniam, or spore-bearing surface, which covers all parts of these 

 ridges and depressions, is thus largely increased in extent. The hyme- 

 nium is that characteristic of the discomycetes being composed of cylin- 

 drical a°,ci and more or less club-shaped paraphyses. Each ascus, with 

 tne exception of one species, contains eight ellipsoidal spores. The pileus 

 is borne on a stout, hollow stem, which is lighter in color than the pileus. 



While the generic characters are well marked, the specific distinctions 

 are not clear, and it has been very puzzling indeed to decide as to what 

 species many of our specimens belong. All of the material for this 

 subject was collected during the past season and comprises six so-called 

 species, as many as Professor Peck lists for the State of New York. 



The species may be arranged in two groups: 



(a.) Pileus adnate throughout to stem. 



(b.) Pileus with the margin free. 



The latter group is made a separate genus by Leveille, under the name 

 Mitrophora. The first group includes four species — esculenta, deliciosa, 



