DR. J. MUELLER ON NEW LICHENS. 451 
EXPLANATION OF PLATE XXXVII. 
Figs. 1, 2, 3. Early stages in development of mucilage-canal before the cavity 
has begun to form. a, the canal initials. From transverse sections 
of a young petiole of A. evecta, x 300. 
Figs, 4, 5, 6. Early stages in development of schizogenous space. Fig. 4, 
simplest possible case. a in fig. 6 is a bridge-cell. From transverse 
sections of the young petiole of 4. evecta, x 300. 
Fig. 7. Advanced stage of a young canal showing how increase in size of cavity 
draws out the bridge-cells, a. ep., epithelium. From transy. sect. of 
a young leaflet of M. cicutefolia, x 300. 
Fig. 8. Adult canal showing epithelium, ep., clearly ; a, probably once a bridge- 
cell, and 2, doubtless due to early tangential division of a canal initial, 
From transy. sect. of a primary rachis of M. cicutefolia, x 300. 
‘'HELOTREMESX et GRaPHIDEE nove quas presertim ex hb. Reg. 
Kewensi exponit Dr. J. Miuurr, F.M.L.S. (Presented 
with the sanction of the Director, Royal Gardens, Kew.) 
[Read lst November, 1894.] 
1. OcetiuLarta Guaziovi, Muell. Arg.; thallus pallide oliva- 
ceus, crassiusculus, ruguloso- et gibboso-inequalis, superficie ipsa 
levis et nitidulus apothecia evoluta adnato-sessilia, plana, 
2-3 mm. lata, margine thallino nano subtenui integro et incurvo- 
obtuso cincta; discus planus, pro genere amplus, strato cesio- 
albo obtectus et rimis numerosis centrum versus convergentibus 
eleganter ornatus ; perithecium interius fusculum, parte basali in 
columellam nigram multiplicem, laminam perpendiculariter pene- 
trantem evolutum; asci 8-spori; spore 18-22 pu longer, 7-10 p 
late, oblongo-ellipsoidex, (4-)6-loculares.—Est species admodum 
insignis. Prima fronte quasi formam macrocarpam simulat Ocel- 
lularie schizostomatis, Muell. Arg., sed margo et lamina multi- 
pliciter columelligera et spore latiores minus divise omnino 
differunt. Subsimile Pheotrema anamorphoides, sc. Thelotrema 
anamorphoides, Ny}. in Flora (1869), p. 120, differt margine 
lacero incurvo, disco poroso et sporis fuscis; et Pheotrema Au- 
berianum, Muell. Arg., habitu magis accedens recedit apotheciis 
minoribus et sporis fuscis.—Corticola, in Prov. Ric de Janeiro: 
Glaziou, n. 5531 pr. p., 5548 pr. p., 5578. 
LINN. JOURN.—BOTANY, VOL. XXX. 2K 
