LICEACEiE. 149 



Dictydium umUlicatum, with two to four minute purple granules on 

 the spore wall; the stalks are stout and rugged, but of the same 

 purple-brown colour as in the latter species. The type of Crihraria 

 exilis Maobride, from Nicaragua (B. M. 1026), is an almost typical 

 . form of Dictydium umbiUcatum, with a shallow cup connecting the 

 slender parallel ribs at the base. 



Hab. On dead wood. —Lyme Eegis, Dorset (L:B.M.n9) ; Wan- 

 stead, Essex (L:B.M.119); Luton, Beds (L:B.M.119) ; Glamis, 

 Scotland (B. M. 241) ; France (Paris Herb.) ; Germany (B. M. 660, 

 663) ; Italy (B. M. 659) ; Ceylon (B. M. 670) ; Borneo (L:B.M.119) ; 

 Maine (B. M. Il05) ; Philadelphia (L:B.M. 119) ; Iowa (B. M. 821) ; 

 S. Carolina (B. M. 666) ; Nicaragua (B. M. 1026). 



SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 



2. D. venosum Schrad., Nov. Gen. Plant., p. 14, pi. iii., fig. 6 

 (1797). Scarcely a line high ; sporangia spherical, cernuous, 

 more or less as in B. umbiUcatum, yellowish-brown, when the 

 spores are shed, colourless ; veined with nine to twelve ribs of 

 rather a brighter colour, the final branches of the ribs lateral, 

 usually not anastomosing ; stalk slender, fiexuose, brownjsh. 



Hab. On rotten pine wood. 



Possibly a form of D. umbiUcatum, with an irregular net. 



Order II. — LiCEACE.aE. Sporangia solitary, sessile or stalked; 

 sporangium- wall cartilaginous ; capillitium and columella wanting. 



KEY TO THE GENERA OF LIGEACE^. 

 Sporangia sessile, globose or plasmodiocarps. (25) Licea. 



Fig. 33. — Licea flexuosa Pers. 

 a. Group of plasmodiocarps. Twice natural size. 

 h. PlasmoJiooarp. Magnified 6 times. 

 V. Spores. Magnified 200 times. 



Fig. 33. 



Sporangia stalked, furnished with a lid of thinner substance. 



(26) Okcadella. 



Fig. 84. — Oroadella operculata Wingate. 

 a. Group of sporangia. Magnified 8 times. 

 i. Sporangium with open lid. Magnified 80 

 times. 



