64 
Dr Greville on two new Genera of Byssoideoe . 
Captain Wauch of Foxhall, discovered this curious member of 
the Byssoideas, and communicated specimens to me in the spring 
of the year 18^4. 
PL I. Fig. 1. Plant natural size. 2. The same enlarged. 
3. One highly magnified. 4. The same with the sporidia 
removed. 5. Sporidia. 
MACROTRICHUM. Greville. 
gen. char. Fila conferia , suberecta , ramosa , (robusta), 
subojpaca , septata, fiexuosa, rigidiuscula . Sporidia spar - 
sa, distincta, color at a, varia. 
1. Macrotriclium ferrugineum. Greville . 
M. effusum , subpulverulentum , ferrugineum , brevissi- 
mis , adscendentibus , fiexuosis , ramulis divergentibus, ob- 
tusis ; sporidiis globosis, ramulis adnatis. 
Hab. In ligno putrido, autumno ; prope Edinburgum, lec- 
tum. 
Desc. Thallus subpulverulentus, late effusus, ferrugineus. 
.FiZa brevissima, conferta, suberecta, ramosa, rigidiuscula, 
septata, plus minusve flexuosa, sub lente aureo-flavescens ; 
ramulis divergentibus, brevibus, obtusis. Sporidia , glo- 
bosa, uniloculata, sparsa, ramis ramulisque primo adnata. 
PL I. Fig. I. Plant natural size. 2. Filaments and spori- 
dia magnified. 
2. Macrotriclium heterosporum. Greville. 
M. ccespitosum,fuscum ; filis brevissimis , suberectis, ramo- 
sis , geniculato fiexuosis, septatis , ramis divergentibus, ob- 
tusis ; sporidiis sparsis, oblongis, 1 — 3 -loculatis. 
Hab, In capsulis emortuis Gentianse campestris, autum- 
no ; prope u Jardine Hall” lectum, Sir William Jardine, 
Bart. 
Desc. Thallus casspitosus, csespitulis vix lineam longioribus. 
Fila brevissima, suberecta, conferta, ramosa, geniculato- 
flexuosa, colorata, subopaca, septata ; ramulis brevibus, di- 
vergentibus, obtusis, rigidiusculis, sub lente aureo-fusces- 
centibus. Sporidia sparsa, libera P, varia, plerumque ob- 
longa, 1-loculata, vel 1 — 2-septata. 
/ 
