340 



CLASS ASCOMTCETEAE 



there are no supernumerary nuclei in the ascus, the many nuclei there 

 produced being the product of the division of the zygote nucleus. Other- 

 wise the ascus resembles that of D. alhidus. No asexual reproduction has 

 been observed in this species. (Fig. 110.) 



Ascoidea, with the single species A. rubescens Bref., also grows in 

 plant exudates (such as the beech, Fagus silvatica L.) and the mycelium 

 consists of multinucleate cells. No fusion of separate gametangia occurs 

 but the oval asci are produced terminally on upright hyphae. They are 

 from the beginning multinucleate and produce very numerous hat-shaped 

 ascospores like those of Hansemda and some species of Endomyces. 



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'is •■.'115 ^ W- 



Fig. 111. Saccharomycetales, Family Ascoideaceae. Ascoidea rubescens Bref. 

 (A) Sympodial formation of conidia. (B) Proliferated asci. (C) Young multinucleate 

 ascus proliferating in discharged ascus. (D) Ascus approaching spore formation, nuclear 

 divisions simultaneous. (E) Portion of ascus with spores. (F) Mature spore. (G-I) 

 Stages in conjugation and germination of spores. (A-B, After Engler and Prantl: Die 

 Natiirlichen Pflanzenfamilien, Leipzig, W. Engelmann. C-I, after Walker: Mycologia, 

 27(2):102-127.) 



