51 



Kirkeby, Skaarup; L. Stensgaard. Echinodorus ranunculoides. J. Ferring! Hasse- 

 l0v near iEbeltoft (Schjatz) ; Samsa (^^/t 72 Thomsen). 



12. Physoderma butomi Schroeter 1882, Syn: Phys. butomi Karst. 

 1888, Syll. IX^«^ Cladochytrium butomi Busg, Fisch. IV ^^« 



July— August; generally all specimens of the host-plant growing in 

 the same place are affected (R04a"). 



Butomus umbellatus. F. Hindsholm (Otto Meller), between Midskov and 

 Mesinge (Exc. ^/s 95), Kirkeby (i^/t 1883); S. Bredered (R 92 g 66), Botanisk 

 Have! Landboh0Jskolens Have, Skjelskar!; Falst. Stubbekebing. 



13. Physoderma heleocharidis (Fuck.) Schroeter, Syll. VII '^^, 

 Syn: Cladochytrium hel. (Fuck.) Biisgen. Fisch. IV. ^'' 



July. 



Scirpus paluster. J. Raabjerg Milesaer!; L. Steensgaard (July 77). 



14. Physoderma acetosellae Rostrup 97 m", Syll. XIV ""l 

 Sporae perdurantiae sive globosae 15—25 (^ diam., sive ellipsoideae, 



30—35 X 23—26 l^ membrana hyalina protoplasmate brunneo farctae, 

 intracellulares, in eadem cellula 1—3. Sporae majores subinde 1—2 

 appendiculatis ovatis instructae. 



Fructibus Rumicis acetosellae deformans. 



The ovary is transformed into a cylindric or somewhat clavate body 

 3 mm long and 1 mm thick, most frequent in all flowers of the affected 

 plant. As far as I have been able to ascertain it is not found outside 

 Denmark. Is particularly found in July. (Se tab. I). 



Rumex acetosella. J. Tolne (V. Schmidt), Tylstrup!, Hobro!, iErteballe, 

 01god (E. W.) ; S. Jonstrup (H. M.), Eremitagesletten (1843 Joh. Lange). 



15. Physoderma deformans Rostrup 85 a, Syn: Frotomyces ane- 

 mones Rostrup (79 '^° nomen nudum). 



The host-plant produces gigantic flowers with a conspicuous, stiff 

 and thick perianth. The affected plants remain a long time after the 

 fading of the other anemones; the leaves have broad and stiff laps, 

 a thick and rugged stalk, the flowers amorphously large up to 8 cm. 

 in diameter with green, crimson or white, cartilaginous, stiff perianth 

 suggesting on Helleborus viridis. The stamens sterile, red or green, 

 the pistil swollen and monstrous. (R 85 a). 



Rostrup adds (1899 a ^^'') that it is not always easy to find the spores 

 of the fungus in the monstrous anemones, but on leaving the plant 

 for about a week in a damp room an abundant number of spores 

 will generally be found, especially in the thick, pulpy perianth. The 

 spores are globular or thick, ovate, 12—16 ^ diameter, with a thick wall 

 and of a pale yellowish colour; the very ramified mycelium is fre- 

 quently rather strongly developed, with very few cross-walls. (See tab. I). 



4* 



