172 A Monograj)h of the Mi/.rogastres. 



in rare instances a swollen portion 15 — 20 )u long, and 8 — 12 \i 

 thick is present near the middle of an elater, but there is no 

 indication of the narrow, ring-like thickenings as in 0. nitcns. 

 From 7 — 9 complete polygons present on a hemisjDhere of a 

 spore. 



* * Episporc warted. 



Oligonema Broomei, Mass. (figs. 185, 186). 



Sporangia scattered or in small grotq^s, adnate by a broad 

 base, hemispherico-depressed, circular or irregularly elongated, 

 wall smooth, dark hrown, dull ; mass of capillitium and spores 

 reddish-ochre ; elaters cylindrical, 3 — 4 /x thick, irreff^ilarly 

 hranched, dull-orange, furnished with narrow, ring-like thicken- 

 ings, at regular distances, tips obtuse ; spores rather coarsely 

 warted, dull orange or yellowish, globose, 13 — 14 ju diameter. 



Oligonema Broomei, Mass., Rev. Trich., Journ, Roy. Micr. 

 Soc, 1889, p. 345, pi. vii., f. 22. 



(Type in Herb., Broome in Brit. Mus., marked " Trichia 

 scrpula" (?).) 



On bark. Britain (Warleigh, Somerset). 



The present species is most neai'ly allied to 0. aeneum, Karst., 

 which has up to the present been only met with in Finland, 

 and is distinguished by the crowded habit, polished sporangia 

 with metallic tints, and smaller spores. 



When circular the sporangia vary from "5 — 1 mm., and when 

 elongated 2 — 3 mm. long. 



Oligonema aeneum, Karst. 



Sporangia densely crowded, often confluent and venulose, rarely 

 scattered, orbicular or angular from mutual pressure, depressed, 

 sinning, with copper, green, or olive metallic tints; threads of the 

 capillitium free, 2 — 3 /a thick, with scattered thickenings in the 

 form of circles; spores globose, wao'ted, rather ferruginous or 

 pale reddish-ochre, 12 /a diameter. 



Oligonema aeneum, Karsten, Myc. Fenn., iv., p. 125; Sacc, 

 Syll, n. 1487 ; Mass., Rev. Trich., p. 346. 



Finland. 



