Opiilotltcca. 131 



Closely allied on the one hand to Perichacna, and on the 

 other to Arcyria. Differs from the latter in the sessile, much 

 compressed sporangia often becoming aethalioid, presence of 

 lime in the wall, and the capillitium with numerous free arms 

 and attached to the wall at many points. From Pcricliciena 

 in the threads of the capillitium being in some way ornamented. 

 Lachnobolus differs in the stipitate sporangia. 



Didrih. Europe ; United States ; Cuba ; Ceylon. Species 9. 



A. Threads of rcjdllitmm spinnlosc. 

 Ophiotheca circumscissa, Curr. 



Sporangia either regular, circular, depressed, or dehiscing in 

 an irregularly circumscissile manner, or becoming aethalioid, 

 sinuous, and often combined into a network ; wall smooth, 

 chestnut, or brown ; mass of capillitium and spores yclloic ; 

 threads of caiyiUitium 2 — 4 }i tJiicIc, with scattered, straight, or 

 hent spines, 1 — 2 ju long, combined to form an irregular network, 

 with numerous free arms often slightly incrassated at the tips ; 

 spores globose, smooth, 8 — 19 /x diameter. 



Olihiotheca chrysospcrma, Curr. Quart. Micr. Journ., v., ii , 

 p. 240, t. 9, f. 1—5. 



Cornuvia circumscissa, Rost., Mon., p. 290 ; Cke., Myx. Brit., 

 p. 76; Sacc, Syll., n. 1452; Schroeter, Kr. Fl. Schles., 108. 



Cornuvia dictyocarpa, Crupa, Cosmos, Lemberg, 18C6; Sacc, 

 Syll., n. 1453. 



On bark. Britain ; Germany ; France ; Switzerland. 



(Rostafinski's Synonyms.) 



Lignidium quereinuni, Fr., Stirp. Femsp., 83 (1825). 

 Trichia circumscissa, Wallr., Fl. Cr. Germ., n. 2219 (1833). 

 Arcyria glomcrata, Fr., Sun. Veg. Scand., 457 (1849). 

 Ophiotheca chrysosp)crma, Microsc. Journ., p. 240, t. 9, f. 1 — o 



(1854), 

 Trirhia Curreyi, Crouan, 1. c, 16 (1867). 



