REMAINING FAMILIES 241 



Stroma by absorbing or crushing adjacent cells. By spring the 

 asci are mature; then the shield becomes fissured and the asci 

 are thereby exposed. 



MoreiweUa vioUemdeae is represented by Arnaud (1918) as 

 possessing spermogonia resembling those described by Luttrell 

 (1940). Such spermogonia have been shown to occur also among 

 species of Asterina. More should be learned regarding their 

 possible role in fertilization. 



Remainixg families. The Polystomellaceae possess ascocarps 

 that expose the asci through a linear aperture, and for this reason 

 the family has been regarded as related to the Hysteriales. Ap- 

 parently all genera are tropical as are also the Hemisphaeriaceae. 

 Theissen (1913, 1913a) divided the Hemisphaeriaceae into two 

 tribes, using the structure of the shield, whether net-like or 

 knotted, as the basis for separation. In this family the asci are 

 scattered, one in each loculus. 



The Trichothyriaceae, monographed by Theissen (1914), are 

 typified by Trichothyrhim sarcinijenim, described by Spegaz- 

 zini in 1889. This species grows upon Aleliola, one of the genera 

 of sooty molds. Certain other members of the family parasitize 

 stromatic Sphaeriales. Approximately a score of species, all 

 tropical, have been described. 



LITERATURE CITED 



Arnaud, G., Les Asterinees. Theses presentes a la Faculte des Sciences de 



Paris. 288 pp. 1918. 

 DoiDGE, Ethel AI., "South African Alicrothyriaceae," Trans. Roy. Soc. 



South Africa, 8: 235-282, 1920. 

 KiLLiAN, C, "Le developpement du Stiginatea robertiani Fries," Rev. gen. 



hotam, 34:511-5^^, 1922. 

 Klebahn, H., Haiipt- and N ehenfrncbtforvien der Ascomyceten. 395 pp. 



Gebr. Borntrager, Leipzig. 1918. 

 Luttrell, E. S., ''Morenoella qiiercina, cause of leaf spot of oaks," MycoL, 



32:652-666, 1940. 

 Ryan, Ruth W., "The development of the perithecia in the Alicrothy- 

 riaceae and a comparison with Alehola," MycoL, 7.?; 100-110, 1926. 

 Theissen, P., "Hemisphaeriales," Aijn. MycoL, 77:468-469, 1913. 



"Uber Alembranstrukturen bei den Alicrothvriaceen als Grundlacre fiir 



den Ausbau der Hemisphaeriales," MycoL Centrb., 5:273-286, 1913a. 

 "Die Trichothyriaceen," Beih. Bot. Centrb., Abt. 2, 32: 1-16, 1914. 

 Theissen, F., and H. Sydow, "Synoptische Tafeln," Aim. MycoL, IS: 389- 



491, 1917. 



