90 Journal of Mycology [Vol. 13 



understood unless given in his own words, which are as follows: 

 Spores of five morphological sorts, not all present in every genus ; 



1. Basidiospores ; minute, thin- walled, without surface 



sculpturing. 



2. Pycniospores ; small, smooth, of unknown function. 



3. Aeciospores ; verrucosely sculptured, borne in chains. 



4. Urediniospores ; echinately or verrucosely sculptured, 



singly, or sometimes in chains (Coleosporium, 

 Melampsoropsis. ) 



5. Teliospores ; smooth or variously sculptured but not 



echinulate, borne singly or in chains. 



The last four named may be present but any one or all but 

 the teliospores may be wanting in certain genera. In many gen- 

 era an alternation of phases is conspicuously shown, says the 

 author, the pycnia (rarely absent) with one other spore-struc- 

 ture comprising the gametophytic phases, and the telia usually 

 with one other spore-structure, the sporophytic phase. In every 

 species the mycelium eventually gives rise to teliospores, which 

 produce in germination four bodies, either remaining within the 

 spore-cell {Coleosporiimi ), or borne in the air on a short my- 

 celium, each basidium supporting a single, stalked or sessile 

 basidiospore. 



Whether the basidia are internal or external is the funda- 

 mental character determining the families ; if internal, the family 

 Coleosporiaceae ; if external, the families Uredinaceae and Aeci- 

 diaceae. The two latter families are readily separated according 

 to the character of the teliospores — they are compacted laterally 

 into a crust or column (rarely solitary within the tissues) in the 

 Uredinaceae, and free or fascicled in the Aecidiaceae. 



Dr. Arthur recognizes for the first family two North Ameri- 

 can genera — Coleosporium, the life-cycle with all spore forms ; 

 and Galloxvaya, with only telia. The latter genus was proposed 

 by the author of the monograph under consideration, last year, 

 before the Botanical Congress at Vienna, to include the single 

 species G. pini {Coleosporium pint Gall.) 



The genus Coleosporium is concisely but fullv described. 

 Attention is here called to one of the statements, as follows : 

 ''Teliospores sessile (by successive formation and by displace- 

 ment due to lateral pressure often appearing catenulate and pedi- 

 cellate), one-celled (by early division of the contents appearing 

 four-celled)." Dietel's Stichopsora is not recognized as a valid 

 genus, but placed as a synonym under Coleosporium. 



The synopsis or key to the species (twenty-four in number) 

 of Coleosporium is similar in structure to all the species-keys 

 that follow and can be explained in a few words. The main 

 divisions are based on the groups of the hosts. Thus, "Telia 

 and uredinia inhabiting monocotyledonous hosts (Orchidaceae)" 

 leads to C. bletiae ; "Telia and uredinia inhabiting dicotyledonous 



