At the time of his death Father Theissen was located at his alma mater. Feldkirch is a little village in the Tyrolean mountains, surrounded by very rugged country. On the 2nd of September, 1919, he made a botanical excursion to the mountains and valleys of Ile de Montafon. He did not return to the college and was missing four days when his body was found badly mutilated at the base of a precipice. He gave his life as a martyr to Science and at the early of 42 years. We have a very pleasant memory of a day spent with Father Theissen at Feldkirch some years ago, and in his death we feel a personal loss.
The name Dimerosporium turned out to be unavailable, so they had been distributed among ~6 other genera. This paper gives a key to those genera and brief descriptions.
Describes 119 species in three sections: Euasterina, Dimerosporium and Clypeolaster. Key to genus of Asterina and the other ten genera of Microthyriaceae that have two-celled ascospores.
Keys to the families of the order and to the genera of the families Microthyriaceae and Hemisphaeriaceae
The Pseudosphaeriaceae, Englerulaceae and the genus Physalospora
Keys to the families and genera of the orders Hemisphaeiales, Myriangiales, and Perisporales. For the details of each order, see Theissen's papers on them ~1913-1914