— 140 — 



127. Wo ronin, 1869. Микологичестя изсл'Ьдовашя. 



28. Zukal, 1889. Entwickeliui geschichtliche Untersuchungen aus 



dem Gebiete der Ascomyceten. Sitzungsb. d. k. Acad. d. 



Wissens in Wien. 



Explanation of the plates I and II. 



All the drawings were made with the aid of the Abbe Camera 

 lucida. Part from alive (2—4, 10, 17, 18, 19, 27, 38, 40, 45, 46), 

 part fi'om fixed and stained material (1, 5 — 9, 11 — 16, 20 — 26, 

 28—37, 39, 41—44, 47—53). 



On figs: 5—7, 11, 14—16, 21—25, 28, 32, 39, 41—44 the 

 hyphae entwining the ascogonia are not reproduced. 



Fig. 1—16. Podospora flmiseda. 



Fig. 1. — Germinating spores. The spherical swollen cell, giving sidegrowths. 

 The. hyphae are divided by transversal walls and send out branches. The cells 

 are multinucleated. X 950. 



Fig. 2. A young spiral coiled ascogonia. The cells are similar in form 

 and dimensions. X 950. 



Fig. 3, 4. Same as fig. 2. Later stage of development. Number of cells of 

 the ascogoninm and, accordingly, the quantity of turns of the spiral have 

 augmented. The beginning of the entivining of the ascogonium by neighbouring 

 hyphae X 950. 



Fig. 5. An ascogonium in the centre of a young perithecium. The cells are 

 different. The lower one wider and short, the rest stretched in length, X 950. 



Fig. 6, 7. Cells of the ascogonium greatly enlarged in size, giving numerous 

 ascogenous hyphae. The latter branch. In the cells of the ascogonium lie large 

 nuclei, in the ascogenous hyphae the nuclei are smaller. X 950. 



Fig. 8. A small portion of branching ascogenous hyphae. The nuclei are 

 disposed in pairs. X 950. 



Fig, 9. Upper part of the ascogenous hyphae, forming at the tip a 

 hook. X 950. 



Fig. 10. Ascogenous hyphae, bearing at the end a young ascus. Section by 

 hand from a living perithecium. X 590. 



Fig. 11 (half schematic). Longitudinal section through a perithecium. Asco- 

 genous hyphae, forming a dense interlacing, greatly develop in the free cavity, 

 lying at the bottom of the perithecium. X 250. 



Fig. 12. Nuclei of different size in the hyphae ^ of a germinating spo- 

 re, X 1200- 



Fig. 13. Muliiuucleate young ascogonia, not yet entwined by hyphae. Di- 

 mensions of the nuclei same as in the vegetative hyphae. X 950. 



