16 44 Proceedings of the Royal Irish Academy. 



Sub-fam. Schizotricheae. 



*Inactis tinctoria (Ag.) Ihur. — LG-; M. trichomes 1-1'5/u broad 



Dasygloea amorpha Berk. — SL, AS. 



Fam. Nostocaceae. 



Sub.-fam. Heterocystidae. 



'Nostoc. minutum Desin. — W, C ; L, trichomes 3-3'3/i broad ; LG, I, CI. B. 

 This was often noticed within the empty tests of Bhizopoda. 

 coeruleum Lyngb. — CP. 

 'Anabaena confervoides Eeinsch. — C, a smaU form.. 1-4-1 "8/* broad, heterocysts 

 2-5^ broad, 4/z long, subangular: D. trichomes 2^ broad. 

 Flos-aquae (Lyngb.) Breb. — L, EL, CI : Cr, trichomes 4-6/* broad, hetero- 

 cysts 8 - 5 broad. 



var. MINOS, var. nov. — Var. ut in forma typica sed latitudine 

 cellularuni 2'5-3/t, heterocystis 3*5-4'5/i C. 

 Hassallii Wittr.— W. 

 oscillarioides Beiuseh. — VL, 3-3*2/* broad, heterocysts 3-4-3'6/t broad, 



42-5-4/i long, 

 variabilis Kiitz. — C, 2-5-3// broad ; L, M, B. 



"inaequalis (Kiitz.) Bom. & Flak — X. W. of D, trichomes bu broad, 

 spores 12"5-15/i long, 6-6-~n broad, heterocysts sub -spherical, 

 6/c broad. 



Fam. Scytonemaceae. 



"Plectonema nostocorum Born. — L ; AS. with Dasygloea amorpha, Stigonema 



turfaceum and other algae. 

 "Scytonema amplum W. & G. S.West — forma HIEERNICAf.iiov. — F.filis 13-1 5/t 

 lat., trichomatibus 3*2— 3*5/u lat.. aerugineis. vagiuis achrois. IT. 

 Tolypothrix distorta (Hofm.-B.) Kiitz. — C, VL, CI : M, sheaths 1 bu, trichomes 9/x. 

 lanata (Desv.) Wartm. — M. 

 tenuis Kiitz. — C. 



Fam. Stigonemaceae. 



Hapalosiphon hibernicus "W. & G. S. West. — C ; W. 7-9/t broad : M : LG, 

 associated with BvJbochaete insignia : S.W. of D. 8-9/i broad in 

 several places. 

 Stigonema mammillosum (Lyngb.) Ag. — M. 

 minutum (Ag.) Hass. — C, M, EL, D. 

 turfaceum Berk.) Conke. — I, AS, D. 



