PROTOMYCES. 141 



In nutritive solutions germination does not take place in this 

 way, but is replaced by a yeast-like sprouting of the sporangial 

 spores without disjunction of the sprout-cells.^ 



According to Meyer, these sprout-cells produce elongated 

 hypha-like cells with which, however, he did not succeed in 

 infecting a new host-plant. He also found that spore-conjuga- 

 tion takes place better in water than in nutritive solutions. 



Pr. fuscus, Pk., occurs on Anemone in America. 



Pr. pachydermus, Thlim., occurs on Compositae esp. Taraxacum. 



Pr. radicicolus, Zopf.^ A form similar to P. macrosporus, 

 but furnished with coiled haustoria. It lives intercellular in roots 

 and kills the cells, without, however, causing external hypertrophy. 

 Zopf found it in roots of Sii/tia Chrysantha and Achillea 

 clypeolata in the botanic garden of Halle, but the plants were 

 not killed, because their roots were not all attacked.^ 



Endomyces. 



The asci contain four spores which do not produce conidia. 

 The sterile hyphae give rise to chlamydospores and an oidial 

 form of spore. 



ETvdomyces decipiens lives as a parasite on sporophores of 

 Agariciis melleus. 



According to Ludwig, species of Endomyces have much 

 to do with the slime-flux of trees, which contain in addi- 

 tion other forms of Gymnoasci, e.g. Saccharomyces Lvdiuigii, 

 Ascoidea rubescens, etc. We shall here devote some space to 

 the general consideration of the slime-flux of living stems. 

 This phenomenon remained uninvestigated until Ludwig took it 

 up and directed attention to it. He found several species of 

 considerable systematic interest, the pathological effects of which, 

 however, require further investigation. 



^Brefeld, ScMmmelpike, Heft ix., 1891. 



^ Zopf, Zur Kenntniss d. In/ectionskrankh. rdedertr Thiers, u. Pflamen, 1888. 



3 Saccardo, who ranks the Protomycetes along with the Chytridiaceae, includes 

 a large number of species. Magnus places Protomyces (?) filicinus, Niessl. ( Ver- 

 hand. des intemat. botan. Kongress in Genoa, 1892) in the neighbourhood of 

 the Phycomycetes ; it, however, possesses a septate mycelium and stylospores 

 which are enclosed in a coat so that they recall spores of the Uredineae, hence 

 Magnus named it Uredinopsis Jilicina on Phegopieris vulgaris. This species 

 must not be confused with the species of Uredo occurring on Phegopteris 

 Dryopterls, Cystopteris fragilis, and Scolopendrium officinale 



