15 102 Proceedings of the Royal Irish Academy. 



Lithophyllum hapalidoides var. confinis Fosl. — CB r. See note, 

 incrustans Phil. — ah. See note, 

 t var. subdichotomum Hcydr. — CB, Roundstone, r. See note, 



lichenoides Ellis.— CI, CB, c. See note. 



[var. agariciformis] Fosl. — Roundstone r. See note, 

 fasciculatum Fosl. — CB /. See note. 

 Lithothamniurn ealeareum Aresch. — CB c. See note. 



* norvegieum Kjellm. — CB/. See note, 

 laevigaturn Fosl. — CI, CB, r. See note, 

 polymorphism Aresch. — c. See note, 

 compactum Kjellm. — CB r. See note. 

 Lenormandi Aresch. — c. See note. 



* var. sublaevis Fosl. — •/. See note. 

 var. squamulosa Fosl. — /. See note. 



Sonderi Hauck.— CB/?. See note. 

 Epilithon membranaceum Hedyr. — CI, CB, /. See note. 

 Corallina officinalis L. — ah. 



squamata Ellis. — c. See note. 



rubens Ellis et Solatid. — c. 



The above list contains the names of 437 species and 36 varieties. Of these 

 3 species and 2 varieties are new to science ; 18 species are additions to the 

 tiora of the British Isles, and in all 92 species and 11 varieties are new to 

 Ireland. For farther details consult Part iv. of the present report. 1 



2. — Notes on the List. 

 Oscillaria laete-virens Crn. 



The cells of the Clare Island specimens are slightly longer than usual in 

 proportion to their width, the filaments being 4 /u. wide, and the cells 6-8 ft 

 long. 



Portlea, May, 1911 ; with Gelidvwm re pens on the under-side of boulders. 



' Maiiine Fungi. — Four species of marine fungi were observed, and may be noted here. (See 

 Report No. 13 of the present series.) 



Ostracoblabe implexa Born et Flah. — A shell-boring species. CB rare. 

 Epicymatia Balani Winter. — Common on barnacles. CB and CI. 

 Mycosphaerella, Ascophylli Cotton. — Constantly present on receptacles of Ascophyllum. 

 Leptosphaeria Chondri Rosenvinge. — Very rare, and second record for British Isles. On 

 Chondrus, washed ashore on Clare Island. (For notes on the above fungi see Cotton, '09.) 



Miss J. Stephens drew my attention to an endophytic organism growing in the sponge Terpios 

 fugax, and giving it a deep blue colour. The organism is apparently a Schizomycete (see Topsent, 

 Arch. Zool. exp. et gen. (3) viii 1900). Terpios fugax is rare on Clare Island, but not uncommon at 

 extreme low- w mark on the islands of Clew Bay. 



