208 



COMPARATIVE MORPHOLOGY OF FUNGI 



walled, the more exposed superficial hyphae are more solid, thicker 

 walled and darker. They form numerous sterile, rigid, very dark- 

 colored spines (up to 1 mm. in length) which may be upright or bent 

 over, simple, branched or forked, with a form often reminiscent of the 

 appendages of Uncinula and Microsphaera in the Erysiphaceae. Accord- 



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Fig. 132. — Meliola corallina. 1. Perithecium with hyphopodia and perithecial spines. 

 2. Median section of a mature perithecium which has discharged all ascospores but one. 

 Meliola evodiae. 3. Mycelial branch with stigmopodia which develop perithecia. Irenina 

 obesa (Meliola obesa). 4. Germ tube with hyphopodia. (1 X 100; 2 X 290; 3, 4 X 330; 

 after Gaillard, 1892; Bucholtz. 1897.) 



ing to the more or less frequent appearance of these mycelial spines, the 

 mats are now thin and crustose, now thick and wooly; occasionally both 

 aspects may occur side by side on the same leaf. 



Besides these spines, the hyphae which tend to form perithecia in 

 older mycelia, form hyphopodia. According to Gaillard, they may 

 be divided into two types, the mucronate and the capitate types. The 



