243 
Localities. Lf: Thyboron; Nykobing; LQ, Lendrup Ron; MK, Holmtunge Hage; F, Lunde Hage; 
ML, Gjols Bredning; stone reef west of Draget; Hals. — Kn: TP, Tonneberg Banke; TG, near Syrodde 
Pynt. — Km: BO, Stensnæs; EZ and XC, south of Læsø. — Ks: NL, Isefjord; Lammefjord; Holbæk 
Fjord. — Sa: Besser Rev, Samsø, partly on Ruppia; MT, Horsens Fjord; Odense Fjord (C. Rosenberg). 
— Sf: Nakkebolle Fjord; Svendborg; U, Birkholm; EA, north of Rudkobing. Sb: Munkebo, Kertinge 
Nor; Avernakhage by Nyborg. — Sm: CM, Kragenæs; CO; CR, off Dyrefoden; Guldborgsund. 
2. Melobesia subplana sp. nov. 
Crusta orbicularis, 1—2 mm diametro, in statu adulto non nisi margine angu- 
sto monostromatico, ceterum 2—6 cellulis crassa, cellulis in parte marginali c. 7—8 y 
latis, cellulis corticalibus rotundatis, in sensu radiali paulo elongatis, trichocytis 
intercalaribus. Fila verticalia partis frondis crassioris cellulis longitudine vario, 
6--9 crassis constituta. Conceptacula sporangifera dense posita, paulo prominula, 
diametro externo c. 150—200 y, interno 70—105 y; sub conceptaculis 1—2 strata 
cellularum vegetativarum; tectum subplanum, c. 2—3 cellulis crassum, ostiolo cellulis 
paulo horizontaliter elongatis, non erumpentibus, vestito. Columella centralis conica. 
Sporangia 42—60 y longa, 26—32 y, lata, semper disporica. Conceptacula mascula 
parva, immersa, nonnunquam tubo longo prorumpente munita, fundo cellulis sper- 
matogenis numerosis elongatis, leniter curvatis, e strato cellularum rotundatarum 
egredientibus, vestito, spermatiis longis, clavatis, leniter curvatis, c. 11 » longis, c. 
2 crassis. Sub conceptaculis masculis 1—3 strata cellularum vegetativarum. Con- 
ceptacula feminea parva, immersa, initio non prominula, stratis cellularum vegeta- 
tivarum 1—3 suffulta. Cystocarpia non certe cognita. 
The specimens which have served as base for this new species were collected 
near Horsens at the east coast of Jutland, growing on Zostera-leaves. They have 
been determined as M. Lejolisii typica by FosLıE, and certainly resemble this species 
very much; they differ however so much from it in some respects that I have 
thought better to regard it as a distinet species. 
The frond is polystromatic with the exception of a narrow marginal zone. It 
consists otherwise of vertical cell-rows composed of 2 to 5 cells, not including the 
small cortical cells, which are cut off by oblique walls. Near the border, the cor- 
tical cells are seen to be rounded, narrow, usually a little lengthened in a radial 
sense, sometimes placed not over the anterior border but over the middle of the 
cell (fig. 160 A). Hyaline hairs are sometimes numerous, given off from cells without 
cortical cells, also from the polystromatical part of the frond. The cells of the ver- 
tical cell-rows are of varying length. There is less contrast between the basal 
layer and the perithallium than in M. Lejolisii, the upper wall of the cells of the 
former falling not always at the same level, the cells thus being of somewhat varying 
height. While in M. Lejolisii the intermedial layer in thicker crusts consists only 
of one layer of long cells, it is in M. subplana usually 2—4 cells thick, its cells 
varying from 1 to 3 diameters in height, shorter and longer cells alternating irre- 
gularly, and the transversal walls falling at different levels in the different filaments. 
31* 
