246 AhOM CHLOROSPERME^E. [Croolepus. 



nute granules, and sessile on a transparent gelatinous mass. — 

 Name; irpo7o<s, first or primary, and kokko?, fruit; from its 

 elementary organization. 



1. P. nivalis, Ag. Crimson Protococcus or Red- Snow. Glo- 

 bules exactly sphserical, very minute, fine purple red, gelatinous 

 mass, pale, spreading. Grev. — Crypt. Fl. t. 231. ( admirable.) 

 Ag. Syst. and Alg. Euro]), t. 21. Harv. in Hook. Br. Fl. v. ii. 

 p. 395. — Hcematococcus Grevillii, Ag. Alg. Europ. t. 23. 



On slightly inundated rocks in various places ; as about Dublin, 

 Limerick, and near Miltown Malbay. This forms stain-like patches on 

 the surface of the rock, or spreads over decaying leaves and sticks. 

 In the Arctic regions, and on several of the high mountains of Europe, 

 it covers the surface of the snow in vast strata, in some places pene- 

 trating to the depth of twelve feet. I have carefully compared speci- 

 mens sent by Professor Agardh from Sweden with those gathered in 

 this country, and find them to agree in every particular. 



Tribe XXI. BYSSOIDE^. 



Plants ofdoid)tfid affinity, related to the Fungi. Filaments 

 articulated, hyaline or coloured. Fructification very obscure. 

 They are found on rotten icood, among mosses, on damp ground, 

 on glass, or in chemical solutions, and in other anomalous situa- 

 tions. 



84. Byssocladium. Ag. Byssocladium. 



Filaments arachnoid, radiating from a centre, with scattered 

 external granules. — Name ; (3vg<tos, a fungus, and /c\aoos, a 

 branch. 



1. B. fenestrate, Ag. Window Byssocladium. Harv. in 

 Hook. Br. Fl. v. ii. p. 379.— Conf. fenestralis, Dillw. t. 94. 



Very common on window-panes and damp glass, on which it forms 

 orbicular whitish spots. 



85. Croolepus. Ag. Croolepus. 



Filaments rigid, subsolid, opaque, erect, minute, falling to 

 powder; joints often contracted. — Name; xpoos, a shin, and 

 \c7rw, to decorticate. — •This genus, as defined by Agardh, con- 

 tains two very distinct tribes, one of which, at least, ought to 

 be removed to the Fungi. 



1. Orange or yellow-green ; fruit roundish eapsides. (Amphi- 

 conium, Spr.J 



1. C. aureus, Harv. Orange Croolepus. Filaments forming 



