146 



Mycologia 



Calyptroinyces ramosus and simplex. The former is well de- 

 scribed and figured. He also describes and illustrates the germi- 

 nation of the spores and the chlamydospores. 



Bonorden described a genus for short-branched Mucors. Five 

 species are listed under the genus. The first, Pleurocystis 

 ascendens, is described and figured as new. This may be an 

 abnormal form of the Karsten species. Pleurocystis fungicola, 

 which is the same as Ascophora fungicola Corda, is probably 

 referable to Calyptromyces ramosus. Pleurocystis Helicostylum 

 and Candelabrum are placed under other genera. This still 

 leaves Pleurocystis Fresenii, which Bonorden says is synonymous 

 with Mucor racemosus Fres. 



This complex group contains some forty described species but 

 the relationship of these species is not well known. There seem 

 to be two modes of branching, monopodial and sympodial. This 

 branching has been made the basis for the division into two 

 groups, Racemo-Mucor and Cymo-Mucor (see Fischer, /. c. and 

 Lendner, /. c). This division, however, is uncertain and un- 

 satisfactory. 



A number of the species produce in addition to the zygospores, 

 azygospores. Of the species referred to this genus by European 

 authors 6 produce azygospores, 6 zygospores only and in 29 neither 

 zygospores nor azygospores have been observed. Of the 12 

 species whose zygospores or azygospores are known, eight belong 

 to the section Racemo-Mucor. Of the 4 remaining species, one is 

 imperfectly described and the branching not definitely known, 

 one is closely allied to the genus Circinella, one has zygospores 

 closely resembling azygospores, and one is described as mono- 

 * podially and sympodially branched. 



Vuillemin has established a new genus (see Zygorhynchus) 

 for two species of this section. The formation of the zygo- 

 spores is the basis for the separation. 



When the zygosporic or the azygosporic characters of the 29 

 remaining species are known some of them may be referred to 

 the genus Calyptromyces, others to the genus Zygorhynchus, and 

 others may have sufficient dif¥erences to justify the establishment 

 of a new genus or even new genera. 



Cultures in known media will in all probability aid in deter- 



