562 



DEMATIEl. 



Order XX. DEMATIEl. 



A rthro lotryum . 

 Periconia. 



Threads free, rarely collected into stem-like bundles, more or 

 less corticated, and carbonized, as are frequently the simple or 

 septate spores. — Berk. OutLj). 342. 



In tlie more typical species tliere is a distinct membrane, which shells off, 

 and where this does not exist the threads are dark and dingy, but never 

 white, er of pure tints. — M.J.B. 



Mocci united in a common stem. 



Spores septate, dark, radiating 



Spores simple, in a globose head 

 riocci free, simple. 



With a vesicular head. 



Spores simple, radiating . 

 Even, straight. 



Spores 1-2 apical, subglobose 



Spores simple, moniliform, basal 

 Torulose. 



Spores solitary, multicellular 

 Thickened at the joints. 



Spores fusiform .... 



Spores biconical, angular . 

 Thickened at the apex. 



Spores curved, apical, m clusters 

 Moniliform 



Spores didymous 

 Flexuous. 



Spores on sporangiform bodies . 

 Obscure or delicate. 



Spores basal, multicellular 

 Flocci free, simple, or branched. 



Spores concatenate, septate 



Spores concatenate, simple 



Spores in a globose head . 



Spores septate, apical 



Spores multiseptate, scattered . 



Spores pedicellate 



Spores triradiate 



Spores flat, spiral 



Spores clavate, at first spiral 

 Flocci branched, flexuous. 



Spores uniseptate 

 Flocci branched, upper joints inflated 



Spores septate .... 

 Flocci with short, verticellate branches. 



Spores single .... 

 Flocci branched, tufted. 



Spores globose, clustered . 



. (EdocepJialum. 



. Monotospora. 



. S_porodv,m. 



. Mystrosporium. 



. Arthrinium. 



. Gonatosporium. 



. Canvptoum. 



. Polythrincium. 



. (Edemium, 



. Macrosporizcm. 



. Dendryphium. 



. Hajilogra-phmm. 



. Sporocyhe. 



. Acrothecium. 



. Helmintkosjjorium 



. Septosponum. 



. Triposporium. 



. Helicoma. 



. Helicocoryne. 



. Cladosporium. 



. Cladotrichum. 



. Stachylotrys. 



. Cephaloirichum, 



