1 1 8 



545. PALMELLA, Lyngb. PALMELLA. 



672. hyalina, Lyngb. Pellucid Palmella. In fresh water streams 

 near Cork : Dr. W. H. Harvey. rather rare. 



673. P. cruenta, Ag. Purple Palmella. On damp walls. 

 rather common. 



546. PROTOCOCCUS, Ag. PROTOCOCCUS. 



674. P. nivalis, Ag. Crimson Protococcus. Red Snow. On rocks 

 and stones, generally slightly covered with water : Dr, W. H. 

 Harvey. rare. 



Tribe XXI. Nostochinece. 

 547. NOSTOC, Vauch. NOSTOC. 



675. N. commune, Vauch. Common Nostoc. Near Cork, Youghal, 

 Cove, &c., on the ground after rain, in winter. common. 



676. N. muscorum, Ag. Papillose Nostoc. On mosses, and on 

 calcareous rocks in several parts : Dr. W. H. Harvey. rather rare. 



677. N. foliaceum, Ag. Foliaceous Nostoc. On moist clayey 

 ground : Mr. Alexander. common. 



678. N. microscqpicum, Carm. Minute Nostoc. On exposed rocks 

 among mosses, near Youghal : Miss Ball. very rare. 



679. N. verrucosum, Vauch. Plaited Nostoc. On stones in our 

 mountain streams : Dr. W. H. Harvey. common. 



Tribe XXII. Byssoidece. 

 548. BYSSOCLADIUM, Ag. BYSSOCLADITJM. 



680. B. fenestrale, Ag. Window Byssocladium. On window panes 

 and damp glass, forming whitish spots. common. 



549. MYCINEMA, Ag. MYCINEMA. 



681. M. arachnoideum, Ag. Cobweb My cinema. On rotten timber 

 near Cove, and in the Great Island : Dr. Scott. very rare. 



550. CHROOLEPUS, Ag. CHROOLEPUS. 



682. C. aureus, Harv. Orange Chroolepus. Under Carrigrohane 

 castle, &c. : Mr. Alexander. very common. 



551. PROTONEMA, Ag. PROTONEMA. 



683. P. orthotrichi, Ag. Parasitic Protonema. Great Island : Dr. 

 Scott. Near Cork : Mr. Alexander. On Orthotrici. common. 



552. HYGROCROCIS, Ag. HYGROCROCIS. 



684. H. atramenti, Ag. Ink Hygrocrocis. On the surface of ink 

 long exposed : Mr. Alexander. very rare. 



553. LEPTOMITUS, Ag. LEPTOMITUS. 



685. L. davatus, Ag. Clulshaped Leptomitus. On the bodies of 

 decaying flies and putrid fish : Mr. Alexander. rare, 



