1 4 2 



DISEASES OF TREES 



short stout lateral branches, which resemble haustoria, into the 

 interior of the parenchymatous cells. 



Colourless stromata of a fleshy, pseudo-parenchymatous 

 structure (Fig. 80, j) form in the cortex beneath the periderm. 

 In cross section these measure 0*3 O'6 mm., while longitudinally 

 their length varies between I and 4 mm. In the month of May 

 the periderm ruptures longitudinally, and reveals the sporogenous 



FIG, 80. Septogloeum Hartigianum. 



.ayer as a greyish green cushion, surrounded by the edges of the 

 elevated periderm (Fig. 80, 2). The surface of the colourless 

 fleshy stroma (Fig. 80, 4) is formed of cylindrical sterigmata, 

 which frequently enlarge somewhat towards the base. These 

 sterigmata measure 30 35 micromillimeters in length and 

 6 7-5 micromillimeters in breadth. The gonidia, which are 

 formed at the apex of the sterigmata, measure, when ripe, 

 from 24 36 micromillimeters in length and 10 12 micromilli- 

 meters in breadth. In shape they are irregularly oblong-oval,, 

 and truncated at both ends (Fig 80, 5). 



