Riddle : Observations on Acrospermum 



181 



this plant from Greenland. And in 1905, Dr. Roland Thaxter 

 collected it at Punta Arenas, Chile, in the Straits of Magellan. 



Harvard University, 



Cambridge, Massachusetts. 



Explanation of Plate i i 



All of the figures, with the exception of nos. 3, 4, 5, and 12, were drawn 

 to the same scale with a Spencer Lens Company 5-x eye-piece and 16 mm. 

 objective; and have been reduced about one third in reproduction. 

 Figs. 1-5. Acrospermum Maxoni Farlow. 



1. Perithecium, face view, with mycelial web at base. 



2. Perithecium, side view. 



3. Single ascus, with spores. 



4. Habit, enlarged about 2 X. 



5. Apex of perithecium cut off and viewed from above to show the ellip- 



tical ostiole. 



Fig. 6. Acrospermum compressum var. gramimtm (Libert) Rehm, from Ra- 



benhorst Fungi Europaei Exsiccati no. 776. 

 Figs. 7-12. Acrospermum compressum Tode. 



7. \Ex herb. Fuckel in herb. Farlow. 



8. Ellis North American Fungi no. 13 18. 



9. Klotzsch Herbarium Vivum Mycologicum no. 738. 



10. Libert Plantae Cryptogamicae Arduennae no. 32. 



11. Longitudinal section of entire perithecium from Kryptogamae Exsic- 



catae Vindobonenses no. 1435. Diagrammatic. 



12. Apical portion of some, more enlarged. Semi-diagrammatic. 



Fig. 13. Lophium dolabriforme Wallr. from specimen collected by R. Thaxter 

 in Chile. 



