96 SUMMARY OF CURRENT RESEARCHES RELATING TO 



perithecia growing on the stems of Levisticum officinale. On the same 

 host was found also the conidial form known as Alternaria tenuis 

 Nees et Cord. The ascospores of the first form agreed precisely with 

 those of Pleospora Sarcinulce Gib. et Griff. Their cultivation gave 

 rise to an abundant mycelium producing Sarcinula-conidiei and sub- 

 sequently perithecia, which again produced ascospores. The second 

 form also gave rise to a mycelium indistinguishable from that of the 

 first, producing immense quantities of green Alternaria-GOmd.ia, but 

 no perithecia. The stylospores from pycnidia found on the same 

 host gave rise to a mycelium which produced both pycnidia and 

 Alternaria-conidia ; but no proof was obtained of any genetic con- 

 nection between the >S'arcmMZa-conidia and perithecia on the one hand, 

 and the Alternaria-comdia and pycnidia on the other hand. 



Cladosporium herbarum, though frequently accompanying all 

 these forms in nature, does not belong to the same cycle of develop- 

 ment. It has two conidial forms ; firstly, an elongated ellipse, un- 

 septated, which are abstricted in clusters, and have a punctated 

 membrane ; secondly, also elliptical but shorter, divided into from one 

 to three chambers, with smooth membrane, not constricted, or very 

 slightly so, at the septa, and abstricted singly from the mycelial 

 branches aggregated in tufts. 



Epicoccum herbarum has also no genetic connection with Pleospora. 



Chytridiacese.* — J. Schaarschmidt describes a new species of 

 Chytridiacese, Phlyctidium Maynaldii, and proposes a fresh classifica- 

 tion of the species living in water, according to the development of 

 the mycelium. The mycelium appears to be wanting in Olpidiopsis 

 and its allies ; the naked plasmodium passes over immediately {Olpi- 

 diopsis) or indirectly (Woronina, Bozella, and perhaps Achlyogeton) 

 into several zoosporangia. In Gliytridium and Phlyctidium the my- 

 celium is a simple filiform structure ; it attains greater development 

 in the genera BMzidium, Polyphagus, Cladochytrium, Obelidium, Zygo- 

 chytrium, and Tetrachytrium ; it is septated and multicellular in 

 Catenaria, Polyrrhina, and Saccopodium. The author found Chytridium 

 globosum and oblongum parasitic on Ulothrix zonata, 



Phoma Gentianae, a new Parasitic Fungus.t — J. Kiihn describes 

 a newly discovered fungus, having its habitat on the stems, leaves, 

 and buds of Gentiana ciliata, and takes the opportunity of denying 

 that plants grown in mountainous districts are freer from such parasites 

 than those of the lowlands. 



Chrysomyxa albida. J — Under this name J. Kiihn describes a new 

 species of parasitic fungus observed on the bramble (Bubus fruticosus) 

 in the Black Forest. It forms small roundish white or yellowish 

 white patches on the under side of the leaves, from • 25 to • 5 mm. 

 in diameter. From these project threads which are the unbranched 



* Magyar Noven. Lapok, vii. (1883) pp. 58-63 (1 pi.) (Magyar and Latin). 

 See Bot. Oentralbl., xv. (1883) p. 370. 



t Landw. Versuchs.-Stat., xxviii. (1883) pp. 455-6. Cf. Joum. Chem. Soc. 

 Abstr., xliv. (1883) p. 1025. 



X Bot. Centralbl., xvi. (1883) pp. 154-7. 



