MESOT.KXM'M. 53 



Palmof/lcea chlamydospora De Bary, in Rabcnh. Alg. 1856, no. 514. 

 Mesotieniuw chlamydosporum v;ir. /-i An-li. 1'iilmoglu'ii and doscrip. Mesot. 



IMil, p. I'fi. (.1, V. I ]<; Cooke, Brit. Desm. 1886, p. 47, t. 18, f. 4. 

 Mesotsenium chlamydosporum var. Archeri Rabenh. Flor. Europ. Ill, 186S, 



p. 117. 



Cells oblong-cylindrical, 2-2J times longer than 

 their diameter, apices broadly rounded or rarely sub- 

 truncately rounded; chloroplast axile, forming a, 

 narrow plate. 



Zygospore irregular, more or less polygonal, becom- 

 ing brown ; outer coat thick and involucrate. 



Length 25-33 ^ ; breadth 11'5-12/u; length of 

 zygosp. 26-38 /JL ; breadth of zygosp. 21-26 /n. 



ENGLAND. Cautley Spout, Widdale Fell, Eldwick, 

 and near Settle, W. Yorks ! Lund's Fell, N. Yorks ! 

 Near St. Just, Cornwall ! 



WALES. Capel Curig and Twll Du, Carnarvonshire ! 



SCOTLAND. Ross, Inverness, Aberdeen, Kincardine, 

 Perth (Roy ]>ixrtt). Rhiconich, Sutherland ! Lewis, 

 Outer Hebrides ! Groat Fell, Arran ! 



IRELAND. Dublin and Wicklow (Archer). Slieve 

 Donard, Down (at 2,000 ft.) ! 



<~r(>o<ji: Dixfi-ilutioii. Germany. Sweden (var.). 

 Poland. Faeroes. India. Argentina. West Indies. 



Forma minor forma nov. 



Mesotteniiim chlamydosporum West, Alg. W. Ireland, 1892, p. 131, t. 24, f. 8 



Cells and zygospores similar to those of the typical 

 form but smaller. 



Length 16-21/u; breadth S'5-10 ^ ; cliam. zygosp. 

 16-25 fi. 



IRELAND. Near Westport, Mayo ! 



Forms large gelatinous masses on wet rocks. 



5. Mesotaenium caldariormn (Lagerh.) Hansg. 

 (PI. IV, figs. 15-17.) 



Mesotxnium Endlicherianum Nag. var. caldariorum Lagerh. Algol. Bidr. 

 1886, p. 48, f. 4 xylogr. 



