808 
DESCRIPTIONS OF THE PLATES. 
ri<^s. 29, 30. More mature condition in which the asci have begun to bud from the ascogejiic 
cell. T^ 4. 
Fig. 31. Mature perithecium showing the ascogenic cell and the mass of asci developed from it 
still supported by the two inferior supporting cells, which will soon be wholly destroyed^ leaving the 
ascus mass free within the cavity of the perithecium. ^ 2. 
Lahoiilhenia elongata Thaxter. 
Fig. 32. Youug perithecium after fertilization, the insertion only of the trichogyne being 
visible (tr). The carpogenic cell (f) has not yet divided, ^g 2. 
Fig. 33. The carpogenic cell has divided into the inferior and superior supporting cells and the 
ascogoniuin. ^ 2. 
Fig. 34. The ascogenic apparatus seen at a stage slightly more advanced than in the previous 
figure. The ascogonium has begun to grow upward on the right before the formation of septa. J 4. 
Fig. 35. Ascogenic apparatus in which the ascogonium has divided into two ascogenic cells 
(ac) and a secondary inferior supporting cell (ist). J 4. 
Fig. 3G. A more advanced stage, in which the asci (as) have begun to bud from the ascogenic 
cells. J 1. Figs. 32-36 represent lateral views. 
Fig. 37. Antero-posterior view of the ascogenic apparatus, showing the two ascogenic cells lying 
side by side and beginning to separate while the asci have already begun to bud. D 12. 
Fig. 38. Two ascogenic cells with asci attached seen as they lie free within the cavity of the 
perithecium. That at the left seen dorsally, that at the right ventrally. J 2. 
Fig, 30. Ascogenic cell with attached asci seen sidewise as it lies free within the cavity of the 
perithecium. J 2. 
A detailed description of the figures on this plate will be found on pages 218-228 of the text. 
The letters correspond in all the figures, and the corresponding structures are as follows: (c) 
primordial cell of perithecium proper; (d) primordial cell of procarpe ; (o, o') basal cells of 
perithecium; (i, i, z) primordial cells of perithecial wall-cells, the parietal, and the canal-cells; (f) 
carpogenic cell j (e") trichophoric cell ; (e') base of trichogyne (tr) ; (no', w, wx, wy, wz) wall-cells 
of the pentheciimi; (wz) lip-cells; (pc) parietal cells of perithecium; (nc', cc, tc) canal-cells of peri- 
tliecuim; (p) stalk-cell of perithecium; (h) secondary stalk-cell; (o') posterior basal cell; (o) one of 
two anterior basal cells; (nn) primordial wall-cells; (am) ascogonium ; (is) inferior supporting cell; 
(»a) superior supportmgcell ; (ist) secondary inferior supporting cell ; (ac) ascogenic cells ; (as) asci ; 
(sm) ascus mass. ° > v / b ? \ / 
