290 



FAMILY OF SACCHAROMYCETACEAE 



MONOSPORA CUSPIDATA. Metschnikoff 



This yeast was found by Metschnikoff in 1884, in the general 



cavity of the Daphnia. It possesses cells 

 which are oval and which elongate to 

 form the asc. Each asc includes a single 

 ascospore, very thin and elongated in the 

 form of a needle. It germinates by bud- 

 ding on a side with the formation of oval 

 cells. (Fig. 137.) The ascospores swal- 

 lowed by the Daphnia reach the intestine 

 and finally the general cavity. Here they 

 bud quickly and cause the death of the 

 animal. Metschnikoff, on account of 

 Fig. 137. Monospora cuspidata. the transparency of this organism, has 

 1- & vegetative c lls as . a Means f been able to follow all the steps in the 



Budding. 8-10, Formation of the Asc. . 



11, Germination of the ascospore (after prOCCSS of phagOCVtOSIS taking place With 



Metschnikoff). 



the cells derived from the ascospores. 



Genus XIV. Nematospora. Peglion l 



Ascospores spindle-shaped with a long cilium at one of the ex- 

 tremities. Germination is accomplished by budding at both ends. 

 Many ascospores in each asc. Up 

 to the present only two species are 

 known. 



NEMATOSPORA CORYLI. Peglion 



This very curious yeast was dis- 

 covered by Peglion in Italy in 1901 

 in moldy hazel nut meats. It de- 

 velops quickly in beef bouillon where 

 it multiplies by budding and pro- 

 duces ascs. The cells are very elon- 

 gated and possess a double wall (Fig. 

 138, 8 and 13). In old cultures, 

 they become round or oval. Bud- 

 ding is always accomplished at the 

 poles as in the yeasts of Dematium. 

 The ascs develop plain on agar and 

 especially on slices of beet. They are very large (65-70 ju long and 

 6-8 JJL wide). They possess 8 ascospores placed in groups of four in 



1 Peglion, V. Ueber die Nematospora Coryli. Notiz, Rendie della Roy. 

 Ac. del Linei, 1897, Cent. Bakt. 7, 1901. 



Fig. 138. Nematospora coryli. 



Ascospore after Disappearance of Cilium. 

 2 to 6, Germination of Ascospore; 7 to 8, 

 Ascs; 9 to 13, Vegetative Cells in Process of 

 Budding; 14 to 16, Abnormal Forms; 17 to 

 18, Stained Ascospores with Nucleus and 

 Cilium (after Peglion). 



