hemitrichia] trichiaceae 229 



tlireads are combined instead of forming free elaters ; it presents 

 nearly the same variety in the shape and colour of the sporangia, and 

 in the markings and colour of the capillitium. Rostafinski's type 

 from Ceylon (K. 1773) has pale yellow-brown sporangia, and rugged 

 capillitium with faint spirals and many large rounded expansions ; 

 the spores are yellow, minutely warted, and measure 10 to 11 /a diam. 

 Specimens from near Dudley, found by Mr. Camm, have both globose 

 and bolster-shaped purple-brown sporangia and orange-brown 

 capillitium, strongly contrasting with the yellow spores. The type 

 of Arcyria paradoxa Mass., from Weybridge (K. 132), closely 

 resembles the Ceylon gathering of H. Karstenii, only differing in 

 the more regular, less branched capillitium, with fewer expansions ; 

 it is therefore included under the present species. The type of 

 Hemiarcyria obscura Rex, from Montana, U.S.A. (B.M. slide), shows 

 a dull yellowish-red capillitium ; the threads are 2'5 to 3/* thick, 

 and are marked with close faint spirals ; the spores are similar to 

 those of the type of H. Karstenii at Kew, and there appears to be 

 no specific character by which to separate H. obscura from this 

 species. The type of Perichaena comuvioides Cel. fil. from Bohemia 

 appears to be an abnormal form of H. Karstenii, in which the capilli- 

 tium shows no trace of spirals, and is marked with many small 

 bladder-like or cup-shaped expansions ; a somewhat similar specimen 

 has been gathered near Birmingham, but in this, part of the capilli- 

 tium is marked also with distinct spiral bands. Such growths closely 

 resemble forms of Perichaena corticalis. 



Hob. On dead wood.— Dudley, Stafford (B.M. 1489) ; Weybridge, 

 Surrey (K. 132) ; Devon (B.M. 2999) ; Yorks (B.M. 3002) ; Aberdeen 

 (B.M."3000); Ireland (B.M. 3001); Sweden (B.M. 3003); Bohemia 

 (B.M. 3004) ; Ceylon (K. 1773) ; Washington State (B.M. 3005) ; 

 Colorado (B.M. 3006) ; Montana (B.M. slide). 



9. H. Serpula Rost. Versuch, 14 (1873). Plasmodium 

 yellow (fide Macbride). Sporangia forming elongated winding 

 branched plasmodiocarps, 0-4 to 0-6 mm. wide, usually forming 

 a close net, golden-yellow or brownish-yellow, often seated on 

 a red-brown hypothallus ; sporangium-wall of two layers, 

 the outer membranous or cartilaginous, yellow, or brownish - 

 yellow from deposits of refuse-matter, the inner membranous: 

 delicately reticulated with a network resembling fan-tracery. 

 Capillitium an elastic tangle of twisting, sparingly branched, 

 yellow threads, 5 to 6 /* diam., marked with three to four 

 rarely five to six well-defined regular spiral bands, spinose 

 or smooth ; longitudinal striae often distinct ; free ends 

 pointed. Spores yellow, reticulated with narrow bands 

 forming a net with from nine to twelve meshes to the 

 hemisphere, 10 to 12 /x diam.; border 0-5 to 1 //, wide. — 

 Macbr. N. Am. Slime-Moulds, 201 ; Petch in Ann. Perad., iv. 

 364. Mucor Serpula Scop. Fl. Cam., ed. 2, ii. 493 (1772). 

 Lycoperdon lumbricale Batsch Elench. Fung., Cont. i. 259. 

 t. 30, fig. 174 (1786). Trichia spongioides Vill. PI. Dauph., 

 1061 (1789). T. Serpula Pers. in Roemer N. Mag. Bot., i. 



