88 Magnus,— On some Species of 
fined to the epidermal cells, which, owing to their being 
attacked in this way, swell out, together with the adjacent 
cells, into a pearl-shaped gall, having a depressed umbo at 
the apex. The apical orifice leads into the much-enlarged 
epidermal cell which contains the Fungus. This species of 
Urophlyctis , which does not extend beyond the epidermal 
cell, forms resting-sporangia by the conjugation of two cells 
derived from different mycelial threads. This I described 
in the paper cited. 
In the second edition of Rabenhorst’s { Kryptogamen-Flora 
von Deutschland, Oesterreich und der Schweiz,’ vol. II. Pilze, 
Part IV, Phycomyceten, p. 1 31, Alfred Fischer unites the 
genera Cladochytrium Nowak., Physoderma Wallr., and 
Urophlyctis Schroet., into one genus Cladochytrium , and in 
it he places the three above-mentioned species. As to the 
formation of the resting-spores in this enlarged genus Clado- 
chytrium he says (p. 132) : ‘ Die Dauersporen entstehen 
entweder an Stelle der Sporangien aus der inhaltsreichen 
Zelle der zweizelligen Anschwellungen und tragen dann eben- 
falls eine kleinere, leere Anhangszelle ; oder terminal an 
kurzen, von den Sammelzellen ausgehenden unverzweigten 
Faden, deren Enden anschwellen und, ohne sich wieder zu 
theilen, zur Dauerspore werden.’ P'ischer does not therefore 
admit the process of conjugation from which the resting- 
spores of Urophlyctis originate, but considers the anthe- 
ridium to be that cell of the two-celled swellings which is 
less rich in protoplasm. 
Without any mention of Fischer’s opinion, however, Schroeter 
retains the genera Physoderma , Cladochytrium , and Urophlyctis 
in Engler and Prantl’s ‘ Natiirlichen Pflanzenfamilien,’ I. Theil, 
1. Abtheilung, pp. 81 and 86, and refers the last-named genus 
to his tribe Oochytriaceae. Possibly at the time when 
Schroeter wrote, Fischer’s paper had not yet been published, 
and nevertheless he quotes Fischer’s ‘ Phycomycetes 51 amongst 
the more important literature on the Chytridiaceae. It may 
1 In Rabenhorst/s Krypt.-Fl. Deut., I. Bd., iv te Abtheil. Leipzig, 1892. 
Lieferungen 45-47. 
