The Scottish Naturalist. 1 1 3 



cutaneous clusters (pustules) of sporules, which at 

 length are erumpent in part, usually rather soft, dull 

 coloured, grey, or Ijrightly coloured. Conidia supported 

 on more or less obsolete basidia, arising from a more 

 or less well-developed stratum. 

 Each of the families is divided into sections by the colour and 

 degree of division of the spores. The largest number of sections 

 is met with in the Sphaerioideae, in which Saccardo re- 

 cognises : 



1. Hyalosporae. 



Sporules i-celled, hyaline, globose, ovoid, or sub-oblong, 

 straight, or sausage-shaped (allantoid). 



2. Phaeosporae. 



Sporules i-celled, olive to sooty-brown, globose, ovoid, or 

 oblong. 



3. Phaeodidymae. 



Sporules 2-celled (1 cross septum), fuscous, ellipsoid, ovoid, 

 or oblong. 



4. Hyalodidymae. 



Sporules 2-celled (1 cross septum), hyaline, or yellowish, 

 ellipsoid, ovoid, or oblong. 



5. Phragmosporse. 



Sporules 2-pluri-septate, oblong or fusoid. 



Sub-section A. Phceophragmiae. 

 Sporules sooty or olive-brown. 



Sub-section B. Hyalophragmiae. 

 Sporules hyaline. 



6. Dictyosporae. 



Sporules 2-pluri-septate, muriform, or radiately septate, 

 sooty, or olivaceous brown. (None yet known with 

 hyaline spores.) 



7. Scolecosporae. 



Sporules rod-like, filiform, or elongate-fusiform, i-celled, or 



with cross septa, hyaline or yellowish. 



In each of the other families similar sections are formed, based, 



as in Spk&rioidea, on the form, structure, and colour 



of the sporules ; but in none of the others are the 



sections quite so numerous. 



It is self-evident that the sections are not of equal value; and 



experience proves them very unequal in number of species. 



H 



