582 FUNGI IMPERFECTi: THE IMPERFECT FUNGI 



and leaves, but on the fruits the setae are lacking. George L. Fawcett, 

 then (1906-1908) a colleague of the author, grew this fungus on over 50 

 different hosts in Miami, Florida. These had been described in literature 

 under 25 or more species names in the two genera Gloeosporium and Col- 

 letotrichum. On many of these hosts the perfect stage was produced and 

 was found to be Glomerella cingulata (St.) Sp. & von S., of the Gnomoni- 

 aceae. Since it grows upon twigs as well as upon the leaves and fruits the 

 distinction between Myxosyorium and Gloeosporium breaks down. The 

 acervuli begin at first as tangled subepidermal masses of hyphae from 

 which arise numerous closely packed conidiophores which partially raise 

 the epidermis. From the apex of each conidiophore are developed one or 

 more conidia, embedded in gum. When moisture is abundant this gum 

 swells and the epidermis is burst open and the spores are exuded in a 

 sticky mass. Insects or other objects coming into contact with these 

 spores distribute them, as does the rain, whose drops striking such a spore 

 mass are broken up into smaller wind-borne droplets, each carrying its 

 burden of spores. Gloeosporium ribis (Lib.) Mont. & Desm. is the imperfect 

 form oi Pseudopeziza ribis Kleb., in Family Mollisiaceae, Order Pezizales. 

 Some species of Myxosporium are imperfect stages of Diaporthe in the 

 Sphaeriales. Marssonina panattoniana (Berl.) Magn. (Hyalodidymae) 

 causes injury resulting in the formation of holes in leaves of lettuce 

 {Lactuca saliva L.) and is sometimes very destructive in greenhouses. 

 Septogloeum (Hyalophragmiae) is mostly parasitic on leaves. It resembles 

 Gloeosporium but the somewhat elongated spores are several times trans- 

 versely septate. (Fig. 193B-C.) Coryneum (Phaeophragmiae) has numer- 

 ous species. C. beijerinckii Oud. occurs in Europe and various parts of the 

 United States as the cause of a serious disease of the peach (Amygdalus 

 persica L.). It kills twigs or may attack the buds and merely kill these and 

 the surrounding tissues, or may cause injury to the fruit. The four- or 

 more-celled spores are dark-colored and long stalked. Pestalotia (Pes- 

 talozzia) also has quite similar spores but the apical cell bears one to 

 three, rarely more, bristles. The terminal cells are lighter colored than the 

 intervening ones. (Fig. 194B.) These are saprophytes on many hosts but 

 some species have been supposed to be harmful parasites. The perfect 

 stages of these two genera are unknown. Cylindrosporiimi (Scolecosporae) 

 causes leaf spots and leaf fall on many plants. The acervuli resemble those 

 of Gloeosporium but the spores are long and slender. Perfect stages have 

 been demonstrated for a few species. Those attacking the genus Prunus 

 have as their perfect stage apothecial fungi belonging, according to 

 Higgins (1914), to the genus Coccomyces, of the Family Phacidiaceae; but 

 according to Nannfeldt (1932) they do not belong to that genus and 

 family but to the Mollisiaceae, and a genus to which he gave the name 

 Higginsia. This name, however, is preoccupied and must be replaced if 

 the genus is held distinct from Coccomyces. 



