115 



Subgen. III. Acioniscium. — Mcmbrana sporangii 

 simplex vel duplex. Columella nivea, raro fuscesccnte alba 

 vel incarnato-flava. Stipes, si adest, niveus. 



6. D. crustaceum Fr. Syst. myc. III, p. 124. 

 Sporangia sessilia, nuuc sparsa, bemisphaerica, nunc 



dcnsissime congcsta bypothalloqve communi, bene evoluto 

 insidentia, bemisphaerica, reniformia vel e pressione mutua 

 angulata. Columella distincta, albido-ve.l incarnato-flava. 

 Flocci capillitii e columella fasciculatim surgentes, tenelli, 

 angulis valde acutis furcati, dilute violaceo-fusci. Sporae 

 sphaeroideae, valde spinulosae, violaceo sive fusco-atrae, diam. 

 11 — 15 mmm. 



Syn. Didymium complanatum Schrad. Nov. Plant. Gen. p. 

 24, t. 5, f. 5. Fr. Syst. myc. III, p. 125. Z>. confluens Rostap. 

 Sluzowc. p. 164. D. crustaceum Rostap. Sluzowc. Dod. I, p. 22. 



Hab. Supra truncos Aini incanae hinc inde circa Mus- 

 tiala, mensibus Septembri et Octobri. Qvoqve prope Åbo 

 mense julii observatum. 



Var. /3. obducens. Didymium obducens Karst. in Not. 

 Sällsk. pro Faun. et Flor. Fenn. Förb. IX, 1868, p. 356. 



Sporangia irregularia (plasmodiocarpa), applanata, de- 

 pressa, saepe umbilicata, subtus concava, solitaria vel gre- 

 garia, interdum dcnsissime stipata, stipitibus brevibus vel 

 brevissimis, irregularibus, inferne latioribus, e hypothallo 

 communi explicatis. 



Hab. Basin trunci Aini incanae, virgulta graminaqve 

 circumjacentia obtegens prope Mustiala. 



7. D. effusum (Lim;.) Fr. Syst. myc. III, p. 124. 

 Sporangia sparsa vel gregaria, sessilia, irregulariter be- 

 misphaerica, applanata. Columella bemisphaerica, nivea vel 



