Perichaena. 117 



and spores clear orange-yellcnv ; capillitium rather scanty, form- 

 ing a loose net, threads 3 5 ^"diameter, sometimes notched or 

 with scattered rudimentary spinules; spores globose, minutely 

 warted, 11 12 /x diameter. 



Hemiarcyria applanata, Cke. and Mass., Grev., vol. xvi., p. 20. 

 (Type in Herb., Kew.) 



On wood. Brisbane. 



From 1 2 mm. diameter. Readily known by the bright 

 grey sporangium and the clear orange spore-mass. The present 

 species, owing to superficial examination, was originally described 

 as a Hemiarcyria. 



Perichaena microcarpa, Schroet. 



Sporangia distinct or confluent in minute clusters, generally 

 globose, 0'5 mm. diameter, rarely unequal, depressed, yellow- 

 brown, smooth, dehiscing irregularly ; capillitium well-developed, 

 threads golden-yellow, 1*5 2 /x thick, combined to form a loose, 

 regular net, thickened at the angles, smooth ; spores golden-yellow, 

 globose, 15 17 ft diameter, epispore strongly aculeolate. 



Perichaena microcarpa, Schroeter, Krypt. Fl. Schles. Pilze, 

 p. 108; Sacc., Syll., vii., pt. I., n. 1445. 



On rotten leaves. Silesia. 



Perichaena Rostafinskii, Karst. 



Sporangia scattered or sub-gregarious, sessile, spherical, yellow- 

 ish then bay, shining; capillitium obsolete; spores globose, 

 smooth, or nearly so, in the mass Uackish-broivn, brownish under 

 the microscope, variable in size, 10 27 /^ diameter. 



Perichaena Rostafinskii, Karst., Myc. Fenn. IV., p. 130 ; Sacc., 

 Syll., n. 1444. 



On dead moss, rotten leaves, &c. Finland. 



The variability in the markings and size of the spores suggests 

 that Karsten has had an immature species under consideration. 



Perichaena confusa, Mass. (n. sp.). 



Sporangia hemispherical and scattered or aethalioid, and often 

 forming an irregular network, pale umber or dingy ochraceous, 



