LEAF FUNGI 171 



MicROTiiYRiACEAE (after Theissen). 



A. Mycelium wanting. 



I. Spores 1-cellecl. 



a. Spores colourless Myocopron. 



b. Spores brown Yizella, 



II. Spores 2-celled. 



a. Spores colourless Microthyrium, 



b. Spores brown. 



1. Thyriothecia circular Seynesia. 



2, Thyriothecia elongated. 



1. Paraphyses* present Lemhosma. 



2. No paraphyses Morenoina. 



III. Spores 3-celled, brown Scutellum. 



IV. Spores 4-celled, brown Haldania. 



V. Spores more than 4-celled, colourless . Phragmothyrium. 



VI. Spores linear, thread-like , . Ophiopeltis. 



B. Mycelium present. 



I, Spores 1-celled, brown Lemhosiella. 



II. Spores 2-celled. 



a. Spores colourless. 



1. Mycelium with hyphopodia Asterella, 



2. Mycelium without hyphopodia . . Calothyrium, 



b. Spores brown. 



1. Thyriothecia round. 



o. Mycelium with hyphopodia. 

 Thyriothecia dehiscing by a 



star-shaped slit Asterina. 



Thyriothecia dehiscing through 

 the dissolution of the cen- 

 tral cells Englerulaster. 



oo. Mycelium without hyphopodia Asterinella. 



2. Thyriothecia elongated. 



o. Spores colourless Lembosiopsis, 



00. Spores brown. 



X. Paraphyses present Lembosia. 



XX. No paraphyses Morenoella. 



*Paraphyses are sterile threads growing amongst the asci. 



Explanation of Plates VII., VIII., IX. 



Fig. 1. — 'Leaves of Curtisia fagmea (the Assegai wood) with black 



spots due to Meliola ganglifcra. 

 Fig. 2. — A. Hypha with capitate hyphopodia. 



B. Hypha with mucronate hyphopodia, (Meliola Pmg- 



garii), 



C. Different types of seti^. 



D. Spores of Meliola spp. 



Fig. .3. — Photomicrograph of Meliola glabra. 

 Fig. 4. — Photomicrograph of Asterina sp. 



